Big change. Implements qualification, which separates the qualification
concerns from the ConsistencyCheck phase.

I'm getting close to implementing a backend.

This stage will be responsible for qualifying all types and attaching
necessary  metadata to make the job of later stages much easier.

Import statements are fully implemented including compiling to an
interface file for faster compilations.

compliation phases.

Stage1 -> Parsed
Stage2 -> Expanded
Stage3 -> Checked