Support doors with keys

Add initial support for doors and keys via pre-defined mappings:
k || d
------
1 -> a
2 -> b
3 -> c
4 -> d

Any key can open any door of its mapping, but is spent once used.
May require additional testing

1 files changed, 6 insertions, 1 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 38208ec..796c3f9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -238,9 +238,14 @@ int main(int argc, char **argv) {
         window.draw(enemy.sprite);
       }
       for (auto &treasure : lvl->treasurePositions) {
-        treasure.sprite.setPosition(to_position(treasure));
         window.draw(treasure.sprite);
       }
+      for (auto &key : lvl->keyPositions) {
+        window.draw(key.sprite);
+      }
+      for (auto &door : lvl->doorPositions) {
+        window.draw(door.sprite);
+      }
     }
 
     if (scene != Scene::LOSS) {