[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/Optimize-RegistryMaterials.patch

@@ -42,3 +42,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
                  builder.add(Pair.of(registrymaterials.c(t0).get(), t0));
              }
+@@ -0,0 +0,0 @@ public class RegistryMaterials<T> extends IRegistryWritable<T> {
+ 
+             registrymaterials.bb.entrySet().stream().filter((entry) -> {
+                 return registrymaterials.c((ResourceKey) entry.getKey());
+-            }).forEach(com_google_common_collect_immutablemap_builder::put);
++            }).forEach(entry1 -> com_google_common_collect_immutablemap_builder.put((java.util.Map.Entry<? extends net.minecraft.server.ResourceKey<T>,? extends T>) entry1)); // Paper - compiler fix (expand method reference + add cast)
+             return com_google_common_collect_immutablemap_builder.build();
+         });
+     }