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/uilabel.lua

@@ -0,0 +1,9 @@
+UILabel = extends(UIWidget)
+
+function UILabel.create()
+  local label = UILabel.internalCreate()
+  label:setPhantom(true)
+  label:setFocusable(false)
+  label:setTextAlign(AlignLeft)
+  return label
+end