Show Runtime entities in the Scene Hierarchy

[dwjclark11]

Desired Feature

We want to be able see runtime entities in the scene hierarchy when the scene is playing.

Desired Solution

• Swap the registry that is currently used in the Scene Hierarchy to the runtime registry.
• This should show all entities that are created at runtime.
• If the entity is created from lua, we should have a flag set inside of the entity class.
• That way we can change the color of the entity in the hierarchy.

TODO: Add more of desired outcome with images.