apt: Trying to make code more managable.
gpu: Moved all non-service-related gpu files into source/gpu/.
gsp: Renamed GSPGPU_submitGxCommand to GSPGPU_SubmitGxCommand.
gpu: Added small description to gpu files.
gsp: Update header as part of renaming.
Merge branch 'refactor' of https://github.com/smealum/ctrulib into refactor