Add RegistryAccess for managing Registries

RegistryAccess is independant from CraftServer and
doesn't require one to be created allowing the
org.bukkit.Registry class to be loaded earlier.

== AT ==
public net.minecraft.server.RegistryLayer STATIC_ACCESS

paper-server/src/main/resources/META-INF/services/io.papermc.paper.registry.RegistryAccess

@@ -0,0 +1 @@
+io.papermc.paper.registry.PaperRegistryAccess

paper-server/src/main/resources/configurations/bukkit.yml

@@ -23,9 +23,6 @@ settings:
     shutdown-message: Server closed
     minimum-api: none
     use-map-color-cache: true
-    compatibility:
-        allow-old-keys-in-registry: false
-        enum-compatibility-mode: false
 spawn-limits:
     monsters: 70
     animals: 10