experimental minimap

* a lot of rework in MapView
* new APIs for UIMap

modules/game/game.otmod

@@ -20,6 +20,7 @@ Module
     - game_containers
     - game_viplist
     - game_battle
+    - game_minimap
     - game_hotkeys
 
   @onLoad: |

modules/game/widgets/uigamemap.lua

@@ -2,6 +2,8 @@ UIGameMap = extends(UIMap)
 
 function UIGameMap.create()
   local gameMap = UIGameMap.internalCreate()
+  gameMap:setKeepAspectRatio(true)
+  gameMap:setVisibleDimension({width = 15, height = 11})
   return gameMap
 end