Move version command update checking to the implementation

This makes it easier for downstream projects (forks) to replace the
version fetching system with their own. It is as simple as implementing
an interface and overriding the default implementation of
org.bukkit.UnsafeValues#getVersionFetcher()

It also makes it easier for us to organize things like the version
history feature.

Lastly I have updated the paper implementation to check against the site
API rather than against jenkins.

Spigot-Server-Patches/ExperienceOrbs-API-for-Reason-Source-Triggering-play.patch

@@ -8,7 +8,7 @@ Adds lots of information about why this orb exists.
 Replaces isFromBottle() with logic that persists entity reloads too.
 
 diff --git a/src/main/java/net/minecraft/server/Block.java b/src/main/java/net/minecraft/server/Block.java
-index 85a5776b04..dedb063de8 100644
+index 85a5776b0..dedb063de 100644
 --- a/src/main/java/net/minecraft/server/Block.java
 +++ b/src/main/java/net/minecraft/server/Block.java
 @@ -0,0 +0,0 @@ public class Block implements IMaterial {
@@ -28,7 +28,7 @@ index 85a5776b04..dedb063de8 100644
          }
  
 diff --git a/src/main/java/net/minecraft/server/ContainerGrindstone.java b/src/main/java/net/minecraft/server/ContainerGrindstone.java
-index 4144a4757d..8a9c81ad62 100644
+index 4144a4757..8a9c81ad6 100644
 --- a/src/main/java/net/minecraft/server/ContainerGrindstone.java
 +++ b/src/main/java/net/minecraft/server/ContainerGrindstone.java
 @@ -0,0 +0,0 @@ public class ContainerGrindstone extends Container {
@@ -41,7 +41,7 @@ index 4144a4757d..8a9c81ad62 100644
  
                      world.triggerEffect(1042, blockposition, 0);
 diff --git a/src/main/java/net/minecraft/server/EntityEnderDragon.java b/src/main/java/net/minecraft/server/EntityEnderDragon.java
-index b3010bee5e..d42d4e83ef 100644
+index b3010bee5..d42d4e83e 100644
 --- a/src/main/java/net/minecraft/server/EntityEnderDragon.java
 +++ b/src/main/java/net/minecraft/server/EntityEnderDragon.java
 @@ -0,0 +0,0 @@ public class EntityEnderDragon extends EntityInsentient implements IMonster {
@@ -54,7 +54,7 @@ index b3010bee5e..d42d4e83ef 100644
  
      }
 diff --git a/src/main/java/net/minecraft/server/EntityExperienceOrb.java b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
-index bfba08fb24..49668f2c21 100644
+index bfba08fb2..49668f2c2 100644
 --- a/src/main/java/net/minecraft/server/EntityExperienceOrb.java
 +++ b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
 @@ -0,0 +0,0 @@ public class EntityExperienceOrb extends Entity {
@@ -134,7 +134,7 @@ index bfba08fb24..49668f2c21 100644
  
      @Override
 diff --git a/src/main/java/net/minecraft/server/EntityFishingHook.java b/src/main/java/net/minecraft/server/EntityFishingHook.java
-index bdd2a39f89..67f8b68413 100644
+index bdd2a39f8..67f8b6841 100644
 --- a/src/main/java/net/minecraft/server/EntityFishingHook.java
 +++ b/src/main/java/net/minecraft/server/EntityFishingHook.java
 @@ -0,0 +0,0 @@ public class EntityFishingHook extends Entity {
@@ -147,7 +147,7 @@ index bdd2a39f89..67f8b68413 100644
                      // CraftBukkit end
                      if (itemstack1.getItem().a(TagsItem.FISHES)) {
 diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
-index 223032e1ec..6df98f845e 100644
+index 223032e1e..6df98f845 100644
 --- a/src/main/java/net/minecraft/server/EntityLiving.java
 +++ b/src/main/java/net/minecraft/server/EntityLiving.java
 @@ -0,0 +0,0 @@ public abstract class EntityLiving extends Entity {
@@ -161,7 +161,7 @@ index 223032e1ec..6df98f845e 100644
              this.expToDrop = 0;
              // CraftBukkit end
 diff --git a/src/main/java/net/minecraft/server/EntityThrownExpBottle.java b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
-index 77dd4c99a6..398b499bbe 100644
+index 77dd4c99a..398b499bb 100644
 --- a/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
 +++ b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
 @@ -0,0 +0,0 @@ public class EntityThrownExpBottle extends EntityProjectileThrowable {
@@ -174,7 +174,7 @@ index 77dd4c99a6..398b499bbe 100644
  
              this.die();
 diff --git a/src/main/java/net/minecraft/server/EntityTurtle.java b/src/main/java/net/minecraft/server/EntityTurtle.java
-index 7c6506a912..1b4933c077 100644
+index 7c6506a91..1b4933c07 100644
 --- a/src/main/java/net/minecraft/server/EntityTurtle.java
 +++ b/src/main/java/net/minecraft/server/EntityTurtle.java
 @@ -0,0 +0,0 @@ public class EntityTurtle extends EntityAnimal {
@@ -187,7 +187,7 @@ index 7c6506a912..1b4933c077 100644
  
          }
 diff --git a/src/main/java/net/minecraft/server/EntityVillager.java b/src/main/java/net/minecraft/server/EntityVillager.java
-index 9ac9d499d5..53e2266a99 100644
+index 9ac9d499d..53e2266a9 100644
 --- a/src/main/java/net/minecraft/server/EntityVillager.java
 +++ b/src/main/java/net/minecraft/server/EntityVillager.java
 @@ -0,0 +0,0 @@ public class EntityVillager extends EntityVillagerAbstract implements Reputation
@@ -200,7 +200,7 @@ index 9ac9d499d5..53e2266a99 100644
  
      }
 diff --git a/src/main/java/net/minecraft/server/EntityVillagerTrader.java b/src/main/java/net/minecraft/server/EntityVillagerTrader.java
-index fee8f97d82..8ced8722a6 100644
+index fee8f97d8..8ced8722a 100644
 --- a/src/main/java/net/minecraft/server/EntityVillagerTrader.java
 +++ b/src/main/java/net/minecraft/server/EntityVillagerTrader.java
 @@ -0,0 +0,0 @@ public class EntityVillagerTrader extends EntityVillagerAbstract {
@@ -213,7 +213,7 @@ index fee8f97d82..8ced8722a6 100644
  
      }
 diff --git a/src/main/java/net/minecraft/server/PathfinderGoalBreed.java b/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
-index d25a05736e..9d0b1ffefa 100644
+index d25a05736..9d0b1ffef 100644
 --- a/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
 +++ b/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
 @@ -0,0 +0,0 @@ public class PathfinderGoalBreed extends PathfinderGoal {
@@ -226,7 +226,7 @@ index d25a05736e..9d0b1ffefa 100644
                  // CraftBukkit end
              }
 diff --git a/src/main/java/net/minecraft/server/PlayerInteractManager.java b/src/main/java/net/minecraft/server/PlayerInteractManager.java
-index 6e90f21ea2..a7411c75ac 100644
+index 6e90f21ea..a7411c75a 100644
 --- a/src/main/java/net/minecraft/server/PlayerInteractManager.java
 +++ b/src/main/java/net/minecraft/server/PlayerInteractManager.java
 @@ -0,0 +0,0 @@ public class PlayerInteractManager {
@@ -239,7 +239,7 @@ index 6e90f21ea2..a7411c75ac 100644
                  // CraftBukkit end
  
 diff --git a/src/main/java/net/minecraft/server/SlotFurnaceResult.java b/src/main/java/net/minecraft/server/SlotFurnaceResult.java
-index d2698e847c..edc4a5c34e 100644
+index d2698e847..edc4a5c34 100644
 --- a/src/main/java/net/minecraft/server/SlotFurnaceResult.java
 +++ b/src/main/java/net/minecraft/server/SlotFurnaceResult.java
 @@ -0,0 +0,0 @@ package net.minecraft.server;
@@ -252,7 +252,7 @@ index d2698e847c..edc4a5c34e 100644
  
      public SlotFurnaceResult(EntityHuman entityhuman, IInventory iinventory, int i, int j, int k) {
 diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
-index adb1a09133..be16fe9a9e 100644
+index adb1a0913..be16fe9a9 100644
 --- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
 +++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
 @@ -0,0 +0,0 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
@@ -265,7 +265,7 @@ index adb1a09133..be16fe9a9e 100644
  
      }
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
-index 38e10017d8..842c28f311 100644
+index 38e10017d..842c28f31 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
 @@ -0,0 +0,0 @@ public class CraftWorld implements World {
@@ -278,7 +278,7 @@ index 38e10017d8..842c28f311 100644
              entity = new EntityLightning(world, x, y, z, false);
          } else if (Firework.class.isAssignableFrom(clazz)) {
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
-index 1b512cc45c..fbad045675 100644
+index 1b512cc45..fbad04567 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
 @@ -0,0 +0,0 @@ public class CraftExperienceOrb extends CraftEntity implements ExperienceOrb {