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/client/gui/implementations/GuiCraftingStatus.java

@@ -108,7 +108,7 @@ public class GuiCraftingStatus extends GuiCraftingCPU
 		{
 			try
 			{
-				NetworkHandler.instance.sendToServer( new PacketValueConfig( "Terminal.Cpu", backwards ? "Prev" : "Next" ) );
+				NetworkHandler.instance().sendToServer( new PacketValueConfig( "Terminal.Cpu", backwards ? "Prev" : "Next" ) );
 			}
 			catch( final IOException e )
 			{
@@ -118,7 +118,7 @@ public class GuiCraftingStatus extends GuiCraftingCPU
 
 		if( btn == this.originalGuiBtn )
 		{
-			NetworkHandler.instance.sendToServer( new PacketSwitchGuis( this.originalGui ) );
+			NetworkHandler.instance().sendToServer( new PacketSwitchGuis( this.originalGui ) );
 		}
 	}