refactor heads-db and added plane controls

src/loading_assets.rs

@@ -1,6 +1,6 @@
 use crate::{
     GameState,
-    head_asset::{HeadDatabaseAsset, HeadsDatabase},
+    heads_database::{HeadDatabaseAsset, HeadsDatabase},
 };
 use bevy::{prelude::*, utils::HashMap};
 use bevy_asset_loader::prelude::*;