Implement lights, thanks @Tarjei400

Now otclient have lights! This code was originally made
by @Tarjei400, I have improved it and merged into otclient
master. Many thanks for tarjei for the contribution.

Warning, this still experimental, fixes may come in the next days.

modules/game_interface/widgets/uigamemap.lua

@@ -4,6 +4,7 @@ function UIGameMap.create()
   local gameMap = UIGameMap.internalCreate()
   gameMap:setKeepAspectRatio(true)
   gameMap:setVisibleDimension({width = 15, height = 11})
+  gameMap:setDrawLights(true)
   return gameMap
 end