Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
fd28180e #479: Add LivingEntity#attack, LivingEntity#swingMainHand, LivingEntity#swingOffHand
ae72ba3a SPIGOT-5591: Allow concurrent potion effects

CraftBukkit Changes:
3d61a853 Fix formatting in CraftLivingEntity
f7ab3055 #633: Add LivingEntity#attack, LivingEntity#swingMainHand, LivingEntity#swingOffHand
d5ef2eab SPIGOT-5591: Allow concurrent potion effects
25a9a9ff SPIGOT-5592: Custom ChunkGenerator can cause bugged dirt
3f6d0de9 Make it clear in error messages that api-version above 1.13 is also supported

Spigot-API-Patches/LivingEntity-setKiller.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] LivingEntity#setKiller
 
 
 diff --git a/src/main/java/org/bukkit/entity/LivingEntity.java b/src/main/java/org/bukkit/entity/LivingEntity.java
-index f5969cad..7e8fc5b3 100644
+index 52541e496..ae712e76d 100644
 --- a/src/main/java/org/bukkit/entity/LivingEntity.java
 +++ b/src/main/java/org/bukkit/entity/LivingEntity.java
 @@ -0,0 +0,0 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
@@ -23,5 +23,5 @@ index f5969cad..7e8fc5b3 100644
 +
      /**
       * Adds the given {@link PotionEffect} to the living entity.
-      * <p>
+      *
 --