[sakai2-tcc] Proposal: eliminate all indies, re-version trunk to CLE 4.0

[Steve Swinsburg]

> Dashboard, ElasticSearch, Keitei, LTI 2.0, tincanapi, Samigo improvements, key library upgrades, eliminating indies, simplifying the build, etc.

Yes, this is a great reason to upgrade! I think that with very little effort we can even slot in a few more major and mature improvements like Roster2, Syllabus, Signup and maybe a few more. 

Just a subtle note that with a major version switch this is an ideal time to move to github. We could just do it for Sakai 5, though that may be a few more years away, do we want to wait that long to get the efficiency and code quality improvements that we so desperately need? 

I don't particularly like Sakai 10 as a version number for the reasons outlined previously, too high a jump and aligning to calendar years locks us in too much.

cheers,
Steve