SPIGOT-7831: Add CreatureSpawnEvent.SpawnReason#POTION_EFFECT

By: Doc <nachito94@msn.com>

paper-server/nms-patches/net/minecraft/world/effect/InfestedMobEffect.patch

@@ -0,0 +1,15 @@
+--- a/net/minecraft/world/effect/InfestedMobEffect.java
++++ b/net/minecraft/world/effect/InfestedMobEffect.java
+@@ -47,7 +47,11 @@
+ 
+             entitysilverfish.moveTo(d0, d1, d2, world.getRandom().nextFloat() * 360.0F, 0.0F);
+             entitysilverfish.setDeltaMovement(new Vec3D(vector3f));
+-            world.addFreshEntity(entitysilverfish);
++            // CraftBukkit start
++            if (!world.addFreshEntity(entitysilverfish, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.POTION_EFFECT)) {
++                return;
++            }
++            // CraftBukkit end
+             entitysilverfish.playSound(SoundEffects.SILVERFISH_HURT);
+         }
+     }

paper-server/nms-patches/net/minecraft/world/effect/OozingMobEffect.patch

@@ -0,0 +1,11 @@
+--- a/net/minecraft/world/effect/OozingMobEffect.java
++++ b/net/minecraft/world/effect/OozingMobEffect.java
+@@ -51,7 +51,7 @@
+         if (entityslime != null) {
+             entityslime.setSize(2, true);
+             entityslime.moveTo(d0, d1, d2, world.getRandom().nextFloat() * 360.0F, 0.0F);
+-            world.addFreshEntity(entityslime);
++            world.addFreshEntity(entityslime, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.POTION_EFFECT); // CraftBukkit
+         }
+     }
+