Update Paper to MC 1.12

Spigot-Server-Patches/Undead-horse-leashing.patch

@@ -20,7 +20,7 @@ index 9987a5c7a..0873febb6 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/EntityHorseAbstract.java b/src/main/java/net/minecraft/server/EntityHorseAbstract.java
-index bed01b8c0..a3c41130f 100644
+index 46d1ea217..dcc39236f 100644
 --- a/src/main/java/net/minecraft/server/EntityHorseAbstract.java
 +++ b/src/main/java/net/minecraft/server/EntityHorseAbstract.java
 @@ -0,0 +0,0 @@ public abstract class EntityHorseAbstract extends EntityAnimal implements IInven
@@ -31,5 +31,5 @@ index bed01b8c0..a3c41130f 100644
 +        return world.paperConfig.allowLeashingUndeadHorse ? super.a(entityhuman) : super.a(entityhuman) && this.getMonsterType() != EnumMonsterType.UNDEAD; // Paper
      }
  
-     protected void s(float f) {
+     protected void q(float f) {
 --