Prior to deleting the TileMap to see if I can just replace it with new features in Map and textures::.

map.cpp

@@ -149,6 +149,7 @@ void Map::load_tiles() {
 }
 
 void Map::enclose() {
+  // wraps the outside edge with solid walls
   std::array<Point, 4> starts{{
     {0,0}, {$width-1, 0}, {$width-1, $height-1}, {0, $height-1}
   }};