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/inventory/item/lockpick.rs

@@ -1,20 +0,0 @@
-use bevy::prelude::*;
-
-use super::*;
-
-// TODO: replace with proper sprite
-const LOCKPICK_SPRITE: &'static str = "sprites/items/choco_bar.png";
-
-#[derive(Component, Debug, PartialEq, Eq, Default, Clone, Copy, Reflect)]
-#[reflect(Component, Debug, PartialEq, Default, Clone)]
-#[require(Item)]
-pub struct Lockpick;
-
-pub fn lockpick_bundle(asset_server: &Res<AssetServer>, position: UVec2) -> impl Bundle {
-    let image = asset_server.load(LOCKPICK_SPRITE);
-    (
-        Item::new_positioned(uvec2(1, 1), position),
-        ItemImage(image),
-        Lockpick,
-    )
-}