Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

modules/corelib/widgets/uiminiwindowcontainer.lua

@@ -0,0 +1,32 @@
+UIMiniWindowContainer = extends(UIWidget)
+
+function UIMiniWindowContainer.create()
+  local container = UIMiniWindowContainer.internalCreate()
+  container:setFocusable(false)
+  container:setPhantom(true)
+  return container
+end
+
+function UIMiniWindowContainer:onDrop(widget, mousePos)
+  if widget:getClassName() == 'UIMiniWindow' then
+  	local oldParent = widget:getParent()
+  	if oldParent == self then
+  		return true
+  	end
+
+  	oldParent:removeChild(widget)
+
+  	if widget.movedWidget then
+  		local index = self:getChildIndex(widget.movedWidget)
+  		self:insertChild(index + widget.movedIndex, widget)
+  	else
+  		self:addChild(widget)
+  	end
+    
+    return true
+  end
+end
+
+function UIMiniWindowContainer:getClassName()
+  return 'UIMiniWindowContainer'
+end