Add command to reset the scene's state entirely.

[moolicc]

scene reload and scene reload module don't reset the entire state of a scene's resources - some contextual values carry over.

It'd be helpful to have a scene reset, and scene reset module commands to completely reload the scene resources WITHOUT holding any information over.

This might be tricky, as the scene resources will more than likely have mutated since scene construction, thus preventing us from getting at the original state.

Also need to define what "original state means".

• A scene may be created with a single entity, is that the original state?
• If we further customize the scene with an additional entity, does that then become the original state?

Evaluate the feasibility of this and implement.