in-game cheat/debug menu

src/player.rs

@@ -484,6 +484,8 @@ pub fn player_input(gs: &mut State, ctx: &mut Rltk) -> RunState {
             VirtualKeyCode::I => return RunState::ShowInventory,
             VirtualKeyCode::D => return RunState::ShowDropItem,
             VirtualKeyCode::R => return RunState::ShowRemoveItem,
+            // Other
+            VirtualKeyCode::Minus => return RunState::ShowCheatMenu,
             VirtualKeyCode::Escape => return RunState::SaveGame,
             _ => {
                 return RunState::AwaitingInput;