Refactored out the tilemap since it was mostly doing nothing useful.

map.cpp

@@ -13,13 +13,11 @@ using namespace fmt;
 Map::Map(size_t width, size_t height) :
   $width(width),
   $height(height),
-  $tiles(width, height),
   $walls(height, matrix::Row(width, SPACE_VALUE)),
   $paths(width, height)
 {}
 
 Map::Map(Matrix &walls, Pathing &paths) :
-  $tiles(matrix::width(walls), matrix::height(walls)),
   $walls(walls),
   $paths(paths)
 {
@@ -144,8 +142,12 @@ bool Map::INVARIANT() {
   return true;
 }
 
-void Map::load_tiles() {
-  $tiles.load($walls);
+void Map::init_tiles() {
+  $tiles = $walls;
+}
+
+Matrix& Map::tiles() {
+  return $walls;
 }
 
 void Map::enclose() {