Fixed up the map generator so that it's placing entities in non-overlapping tiles and adapting the style for the size. It can also deal with maps that have no rooms better and places the stairs better.

levelmanager.cpp

@@ -17,8 +17,8 @@ LevelManager::LevelManager() {
 
 LevelScaling LevelManager::scale_level() {
   return {
-    21,
-    21
+    INITIAL_MAP_W + int($current_level * 2),
+    INITIAL_MAP_H + int($current_level * 2)
   };
 }