Refactored window clicking code to use different click actions

First part of solving FS #371; should fix #370.

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1459 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/UI/Window.h

@@ -72,7 +72,7 @@ public:
 
 	void Clicked(
 		cPlayer & a_Player, int a_WindowID, 
-		short a_SlotNum, bool a_IsRightClick, bool a_IsShiftPressed,
+		short a_SlotNum, eClickAction a_ClickAction,
 		const cItem & a_ClickedItem
 	);