Add GUILayer component. Add implementation for P0T0Builder. Add basic skeleton for GuiRenderer.
Fix Entity::GetComponent() to check only enabled components.
Add axuliary Component's methods for its owner's queries.
Remove unique component type restriction in Entity.
Add FindAllComponents() method to Entity and Component classes.
Add axuliary method HasComponent() to Component.
Add Menu and MenuScript.
Add instancing and Texture sort mode to SpriteRenderer.
Fix bug in DynamicVertexBuffer SetData() implementation.
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