restore containers

* implemente Container class
* restore module containers
* add lua bindings for std::map
* improve grid layout
* fixes in UIItem rendering
* changes in miniwindow design

modules/game_containers/containers.otmod

@@ -4,5 +4,12 @@ Module
   author: OTClient team
   website: https://github.com/edubart/otclient
 
+  dependecies:
+    - game
+
   @onLoad: |
     dofile 'containers'
+    Containers.init()
+
+  @onUnload: |
+    Containers.terminate()