Serialize Entity Trees to/from JSON

[craftablescience]

Component to Improve

Core Engine

Describe Your Suggestion

reflect/Props.h has a rudimentary reflection system.

• [ ] Should we be using a proper library like RTTR instead? This would help with scripting too
• [x] ~~The current system doesn't work with inheritance, this is a critical flaw~~ Fixed, works with single inheritance
• [ ] Entities should be recursively serialized and saved to a scene JSON file
• [ ] Scene files can be loaded to restore the scene