EngineLib

I may have forgotten to mention this in my previous log, but I also implemented an Instantiate method in EngineLib.

Instantiate takes an entity definition as a JSON file (ig a prefab) and spawns the entity into the current scene.

I also added scene related functionality to EngineLib:

• LoadScene Loads a scene from a given path
• GetCurrentScenePath Returns the path of the currently loaded scene