新增flag 帮助处理位掩码

source/src/ECS/Components/Physics/Collider.ts

@@ -0,0 +1,8 @@
+abstract class Collider extends Component{
+    public shape: Shape;
+    public physicsLayer = 1 << 0;
+
+    public get bounds(): Rectangle {
+        return this.shape.bounds;
+    }
+}