feat: Barely working tilemap system

- Added tilemap bundle
- Added HALVED_METERS_PER_PIXEL constant

src/layout/container.rs

@@ -2,13 +2,11 @@ use bevy::prelude::*;
 use bevy_rapier2d::prelude::*;
 
 use crate::{
-    GameState,
-    PIXELS_PER_METER,
-    inventory::{
+    GameState, HALVED_PIXELS_PER_METER, PIXELS_PER_METER, inventory::{
         ActiveInventory,
         Inventory,
         item::Item,
-    },
+    }
 };
 
 use super::*;
@@ -47,7 +45,7 @@ pub fn container_bundle(
     let image = asset_server.load(CRATE_CLOSED_ASSET);
     (
         Container,
-        Transform::from_xyz(position.x, position.y - PIXELS_PER_METER * 0.5, 0.),
+        Transform::from_xyz(position.x, position.y - HALVED_PIXELS_PER_METER, 0.),
         Sprite::from_image(image),
         Inventory::new(inventory_size),
         Observer::new(on_container_interact),
@@ -56,7 +54,7 @@ pub fn container_bundle(
             Spawn((
                 Collider::cuboid(PIXELS_PER_METER, PIXELS_PER_METER),
                 Sensor,
-                Transform::from_xyz(0., PIXELS_PER_METER * 0.5, 0.),
+                Transform::from_xyz(0., HALVED_PIXELS_PER_METER, 0.),
             )),
         )),
     )