Refactored AEConfig (#2633)

Added a singleton getter instead the public field.
Reduced all fields to private.
Replaced field access with getters.
Added setters where necessary (Dimension/Biome Registration)
Added config options to disable more features.
Splitted Enum name from the config key.
Changed FacadeConfig and Networkhandler similar to AEConfig.init().

src/main/java/appeng/server/ServerHelper.java

@@ -109,7 +109,7 @@ public class ServerHelper extends CommonHelper
 
 				if( dX * dX + dY * dY + dZ * dZ < dist * dist )
 				{
-					NetworkHandler.instance.sendTo( packet, entityplayermp );
+					NetworkHandler.instance().sendTo( packet, entityplayermp );
 				}
 			}
 		}

src/main/java/appeng/server/subcommands/ChunkLogger.java

@@ -49,7 +49,7 @@ public class ChunkLogger implements ISubCommand
 
 	private void displayStack()
 	{
-		if( AEConfig.instance.isFeatureEnabled( AEFeature.ChunkLoggerTrace ) )
+		if( AEConfig.instance().isFeatureEnabled( AEFeature.CHUNK_LOGGER_TRACE ) )
 		{
 			boolean output = false;
 			for( final StackTraceElement e : Thread.currentThread().getStackTrace() )