refactor heads-db and added plane controls

src/main.rs

@@ -11,8 +11,8 @@ mod cutscene;
 mod debug;
 mod gates;
 mod head;
-mod head_asset;
 mod heads;
+mod heads_database;
 mod hitpoints;
 mod keys;
 mod loading_assets;
@@ -42,7 +42,7 @@ use bevy_trenchbroom::prelude::*;
 use bevy_ui_gradients::UiGradientsPlugin;
 use camera::MainCamera;
 use control::controller::CharacterControllerPlugin;
-use head_asset::HeadDatabaseAsset;
+use heads_database::HeadDatabaseAsset;
 use loading_assets::AudioAssets;
 use std::io::{Read, Write};
 use utils::{billboards, sprite_3d_animation, squish_animation};