Refactor OASIS feature to be a separate module and reference respec core

[sspeiche]

Robin Berjon outlined the approach over in upstream issue

Current problem is that the OASIS feature is a complete build of all of respec, which causes additional work to keep this fork current. We can break it off completely and treat a stable release of respec as an external dependency.

Basically this is what should be done to decouple the OASIS work from the main respec capability.

[lonniev]

If you are going to work this issue then just ping me when you are done. If you are only placeholding the enhancement here then I will:

• fork your repo
• create a clean project that implements an add-nothing base that includes Robin's ReSpec
• surgically cherry pick from your implementation to the new project's base
• smoke test the result.

[sspeiche]

I'm not even sure what you need to fork or pull in any of Robin's ReSpec. It might make sense to just cherry-pick my changes (which are all additive files). Then again, not even sure the change history is all that important.

If you want to run with it, great. I may be able to give it a go within a week. If you are eager to get on it, go for it