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/recipes/RecipeHandler.java

@@ -422,7 +422,7 @@ public class RecipeHandler implements IRecipeHandler
 			AELog.info( "Recipes Loading: " + e.getKey().getSimpleName() + ": " + e.getValue() + " loaded." );
 		}
 
-		if( AEConfig.instance.isFeatureEnabled( AEFeature.WebsiteRecipes ) )
+		if( AEConfig.instance().isFeatureEnabled( AEFeature.WEBSITE_RECIPES ) )
 		{
 			try
 			{