Add audio subsystem with mute and volume controls

Update flake.lock dependencies to latest revisions

src/app/views/skirmish.rs

@@ -23,6 +23,9 @@ const ACTIONS: &[Action] = &[
     Action::ScrollRight,
     Action::ZoomIn,
     Action::ZoomOut,
+    Action::VolumeUp,
+    Action::VolumeDown,
+    Action::Mute,
     Action::Quit,
     Action::Quit2,
     Action::Esc,