Start and stop some sounds and add a little bit of reverb to sounds so they fit the 'dungeon' theme.

sound.cpp

@@ -53,6 +53,19 @@ namespace sound {
     }
   }
 
+  void stop(const std::string name) {
+    dbc::check(initialized, "You need to call sound::init() first");
+
+    if(SMGR.sounds.contains(name)) {
+      // get the sound from the sound map
+      auto pair = SMGR.sounds.at(name);
+      pair.sound->stop();
+    } else {
+      dbc::log(fmt::format("Attempted to stop {} sound but not available.",
+            name));
+    }
+  }
+
   void play_at(const std::string name, float x, float y, float z) {
     dbc::check(initialized, "You need to call sound::init() first");
     if(SMGR.sounds.contains(name)) {