[1.16] Make it run (#3626)

* She compiles!

Also readded the armorstand ticking patch, thanks cat

* Update mob goal api

* Misc fixes to make it run

drop per playing mob spawns for now

Spigot-Server-Patches/Remove-FishingHook-reference-on-Craft-Entity-removal.patch

@@ -17,10 +17,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    @Override
 +    public void remove() {
 +        super.remove();
-+        if (getHandle().owner != null) {
-+            getHandle().owner.hookedFish = null;
++        if (getHandle().getOwner() != null) {
++            getHandle().getOwner().hookedFish = null;
 +        }
 +    }
 +    // Paper end
-+    
++
  }