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/layout/container.rs

@@ -0,0 +1,62 @@
+use bevy::prelude::*;
+use bevy_rapier2d::prelude::*;
+
+use crate::{
+    GameState,
+    PIXELS_PER_METER,
+    inventory::{
+        ActiveInventory,
+        Inventory,
+        item::Item,
+    },
+};
+
+const CRATE_CLOSED_ASSET: &'static str = "sprites/interactive/crate_closed.png";
+
+use super::*;
+
+#[derive(Component)]
+#[require(Sprite, InteractiveObject, Inventory)]
+pub struct Container;
+
+fn on_container_interact(
+    event: On<InteractionEvent>,
+    mut commands: Commands,
+    locked_query: Query<(), With<Locked>>,
+    crate_query: Query<(), With<Container>>,
+    mut next_state: ResMut<NextState<GameState>>,
+) {
+    if locked_query.get(event.entity).is_ok() {
+        return;
+    }
+    if crate_query.get(event.entity).is_err() {
+        return;
+    }
+
+    commands.entity(event.entity).insert(ActiveInventory);
+    next_state.set(GameState::Inventory);
+}
+
+pub fn container_bundle(
+    asset_server: &Res<AssetServer>,
+    position: Vec2,
+    inventory_size: UVec2,
+    items: Vec<Item>
+) -> impl Bundle {
+    let image = asset_server.load(CRATE_CLOSED_ASSET);
+    (
+        Container,
+        Transform::from_xyz(position.x, position.y - PIXELS_PER_METER * 0.5, 0.),
+        Sprite::from_image(image),
+        Inventory::new(inventory_size),
+        Observer::new(on_container_interact),
+        Children::spawn((
+            SpawnIter(items.into_iter()),
+            Spawn((
+                Collider::cuboid(PIXELS_PER_METER, PIXELS_PER_METER),
+                Sensor,
+                Transform::from_xyz(0., PIXELS_PER_METER * 0.5, 0.),
+            )),
+        )),
+    )
+}