Prepping map stuff

src/rpg/world/tile.c

@@ -8,5 +8,9 @@
 #include "tile.h"
 
 bool_t tileIsWalkable(const tile_t tile) {
-  return tile == TILE_WALKABLE;
+  return (
+    tile == TILE_WALKABLE || 
+    tile == TILE_STAIRS_UP || 
+    tile == TILE_STAIRS_DOWN
+  );
 }