Add Rowan v2 support to smalltalkCI

[dalehenrich]

Back in 2018, I made a first attempt to add Rowan support to smalltalkCI on the smalltalkCI rowan branch. For a number of reasons I never got very far with the effort.

Fresh on the heels of the recent work updating GemStone support for Ubunutu 20.04 and recent macOS versions I am motivated to make another attempt at adding Rowan support to smalltalkCI.

Similar to the original project, I plan to:

• [x] Repackage with an eye to isolating the classes Gofer, MCHttpRepository, MCOrganizationDefinition, Metacello, MetacelloIgnorePackageLoaded, MetacelloProjectRegistration from the Rowan code base.
• [x] The Smalltalk class will be created as a stub class and implement the methods called from smalltalkCI.
• [x] Partition the Monticello specific tests into a separate Monticello test package that would not be loaded for Rowan
• [ ] Add Rowan specific classes and scripts
• [ ] Write a SCIRowanLoadSpecTest

There are plans to support MetacelloMonticello in the GemStone kernel in some fashion, but the details of that support have not been worked out yet.

[dalehenrich]

Have just finished up work as part of GemStone 3.7.0, where I've done a bit of repackaging that allows the smalltalkCI to be loaded into a Rowan image (i.e., no Metacello/Monticello) and the refactoring was not aggregious, I think ... Anyway, the smalltalkCI:rowanV2 branch (SHA 8720012) is being used to run internal CI pre-release testing against the GsDevKit projects.

The remaining work mainly revolves around adding Rowan-specific load specs ...