Now have doors that you can walk though. No open/close animation yet.

src/graphics/raycaster.cpp

@@ -312,6 +312,7 @@ void Raycaster::cast_rays() {
     int draw_end = line_height / 2 + $height / 2 + $pitch;
     if(draw_end >= $height) draw_end = $height - 1;
 
+    // BUG: I thought I got rid of this
     auto texture = textures::get_surface($tiles[map_y][map_x]);
 
     // calculate value of wall_x