Added CustomGuiEvent.SlotClickEvent to the scripting GUI.

src/main/java/noppes/npcs/client/gui/script/GuiScriptInterface.java

@@ -146,6 +146,7 @@ public class GuiScriptInterface extends GuiNPCInterface implements GuiYesNoCallb
                 hookList.add("customGuiClosed");
                 hookList.add("customGuiButton");
                 hookList.add("customGuiSlot");
+                hookList.add("customGuiSlotClicked");
                 hookList.add("customGuiScroll");
                 hookList.add("customGuiTextfield");