Fix certain types to be abstract

[d4v3y5c0n3s]

Currently some types are not abstract in order to get the engine to a workable state faster. An example in the code currently would be the vertex type in g_engine.dats. Once I finish getting the engine working, then I'll come back to this.

[d4v3y5c0n3s]

I've determined that some types (such as vectors) don't need to be fully abstracted, because their structure will never change. However, I should abstract scalars so that they may be doubles or floats instead of just being hard-coded to floats.