Added all GUIs. Nothing more to do here. Last step: New GUI. And then: Release! Finally =D

src/main/java/de/skate702/craftingkeys/config/ConfigGui.java

@@ -13,6 +13,7 @@ import java.util.List;
 /**
  * Custom Config Gui for Mod Options inside of Minecraft.
  */
+@Deprecated
 public class ConfigGui extends GuiConfig {
     public ConfigGui(GuiScreen parent) {
         super(parent, getConfigElements(),

src/main/java/de/skate702/craftingkeys/config/ConfigGuiFactory.java

@@ -9,6 +9,7 @@ import java.util.Set;
 /**
  * A Config Gui Factory which always returns the ConfigGUI-Class. Nothing more to see here, go away!
  */
+@Deprecated
 public class ConfigGuiFactory implements IModGuiFactory {
     @Override
     public void initialize(Minecraft minecraftInstance) {

src/main/java/de/skate702/craftingkeys/config/GuiConfig.java

@@ -0,0 +1,6 @@
+package de.skate702.craftingkeys.config;
+
+import net.minecraft.client.gui.GuiScreen;
+
+public class GuiConfig extends GuiScreen {
+}