Made some progress on the first pass on the documentation

I finished fixing the issues with the BlackMagic example project. And took the time to fix a few things I felt were inconsistent about how the ContentMeta stored the gameobjects.
Also added a feature that allows mods to overwrite content from other mods by using the same content ID. For this feature to fully work I will have to implement a load-order and mod-dependency feature. But I'll be doing that at a later time when its actually needed.

Fixed a really crazy bug in my code that I have been fighting with for a few days. Also removed the systems dependency on a messaging framework. Replaced it with C# events.