Vehicle Dismount Event Improvements

player.getVehicle() was returning null during the event. Paper had added lots of code to
cause the player to remount the entity on cancel.

I've simplified the diff and made player.getVehicle() work during the event by setting the
vehicle back during the event, and only set it to null if the event is not cancelled.

Spigot-Server-Patches/Optional-old-TNT-cannon-behaviors.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Optional old TNT cannon behaviors
 
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 4d6a30966..2a4d1dae7 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
@@ -22,7 +22,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/BlockDiodeAbstract.java b/src/main/java/net/minecraft/server/BlockDiodeAbstract.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 59ee13de8..40c9f18bf 100644
 --- a/src/main/java/net/minecraft/server/BlockDiodeAbstract.java
 +++ b/src/main/java/net/minecraft/server/BlockDiodeAbstract.java
 @@ -0,0 +0,0 @@ public abstract class BlockDiodeAbstract extends BlockFacingHorizontal {
@@ -62,7 +62,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              int i = aenumdirection.length;
  
 diff --git a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index c7e095a11..741236289 100644
 --- a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
 +++ b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
 @@ -0,0 +0,0 @@ public class BlockRedstoneTorch extends BlockTorch {
@@ -110,7 +110,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          return this.isOn && iblockdata.get(BlockRedstoneTorch.FACING) != enumdirection ? 15 : 0;
      }
 diff --git a/src/main/java/net/minecraft/server/BlockRedstoneWire.java b/src/main/java/net/minecraft/server/BlockRedstoneWire.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 5a0f026b1..20b9465e7 100644
 --- a/src/main/java/net/minecraft/server/BlockRedstoneWire.java
 +++ b/src/main/java/net/minecraft/server/BlockRedstoneWire.java
 @@ -0,0 +0,0 @@ public class BlockRedstoneWire extends Block {
@@ -160,7 +160,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              int i = aenumdirection.length;
  
 diff --git a/src/main/java/net/minecraft/server/BlockTNT.java b/src/main/java/net/minecraft/server/BlockTNT.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 6b6aa892a..5cec4160c 100644
 --- a/src/main/java/net/minecraft/server/BlockTNT.java
 +++ b/src/main/java/net/minecraft/server/BlockTNT.java
 @@ -0,0 +0,0 @@ public class BlockTNT extends Block {
@@ -190,7 +190,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                  world.addEntity(entitytntprimed);
                  world.a((EntityHuman) null, entitytntprimed.locX, entitytntprimed.locY, entitytntprimed.locZ, SoundEffects.gV, SoundCategory.BLOCKS, 1.0F, 1.0F);
 diff --git a/src/main/java/net/minecraft/server/DispenserRegistry.java b/src/main/java/net/minecraft/server/DispenserRegistry.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index dbfb8ab3e..537408a15 100644
 --- a/src/main/java/net/minecraft/server/DispenserRegistry.java
 +++ b/src/main/java/net/minecraft/server/DispenserRegistry.java
 @@ -0,0 +0,0 @@ public class DispenserRegistry {
@@ -207,7 +207,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                     world.getServer().getPluginManager().callEvent(event);
                  }
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 44c5a253f..fc43007c6 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
 +++ b/src/main/java/net/minecraft/server/Entity.java
 @@ -0,0 +0,0 @@ public abstract class Entity implements ICommandListener {
@@ -262,7 +262,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      }
  
 diff --git a/src/main/java/net/minecraft/server/EntityFallingBlock.java b/src/main/java/net/minecraft/server/EntityFallingBlock.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 307a44c85..bb01929e8 100644
 --- a/src/main/java/net/minecraft/server/EntityFallingBlock.java
 +++ b/src/main/java/net/minecraft/server/EntityFallingBlock.java
 @@ -0,0 +0,0 @@ public class EntityFallingBlock extends Entity {
@@ -286,7 +286,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/server/EntityTNTPrimed.java b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index 25e471d37..e796ade87 100644
 --- a/src/main/java/net/minecraft/server/EntityTNTPrimed.java
 +++ b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
 @@ -0,0 +0,0 @@ public class EntityTNTPrimed extends Entity {
@@ -366,7 +366,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/server/Explosion.java b/src/main/java/net/minecraft/server/Explosion.java
-index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+index d7bc6a0ed..f2785d86c 100644
 --- a/src/main/java/net/minecraft/server/Explosion.java
 +++ b/src/main/java/net/minecraft/server/Explosion.java
 @@ -0,0 +0,0 @@ public class Explosion {