refactor!: Item changes

- Bump version to 0.3.0
- Moved crate::inventory::item to crate::item
- Made Item.position non-option
- Renamed Item::new_positioned -> Item::new
- Removed old Item::new method
- Changed Inventory.can_fit signature to use item borrow

src/layout/systems.rs

@@ -7,7 +7,7 @@ use bevy_rapier2d::prelude::*;
 
 use crate::{
     meters,
-    inventory::item::lockpick::lockpick_bundle,
+    item::lockpick::lockpick_bundle,
     player::{
         Player,
         player_bundle,