restore old modules

* partially restore vip, battle, healthbar, skills and inventory modules
* more fixes on UIWidgets
* implement UIMiniWindow close/minimize functionality
* allow drag and drop miniwindows beteween game panels

modules/game/widgets/uiminiwindowcontainer.lua

@@ -8,7 +8,8 @@ function UIMiniWindowContainer.create()
 end
 
 function UIMiniWindowContainer:onDrop(widget, mousePos)
-  print 'drop'
+  widget:setParent(self)
+  return true
 end
 
 function UIMiniWindowContainer:getClassName()