refactor!: Split everything into submodules

- Bump version to 0.2.0
- Split every module to systems, observers, plugins, etc
- Renamed Crate to Container
- Removed Wall component
- Removed try_insert_item system
- Removed inventory::ui module

src/main.rs

@@ -1,4 +1,10 @@
-use bevy::{prelude::*, remote::{RemotePlugin, http::RemoteHttpPlugin}};
+use bevy::{
+    prelude::*,
+    remote::{
+        RemotePlugin,
+        http::RemoteHttpPlugin,
+    },
+};
 
 use expedition_demo::ExpeditionPlugin;