Drop topic stage workflow configuration

Drop the 'Utilities/GitSetup/SetupGitAliases.sh' script and
topic stage configuration in 'Utilities/GitSetup/config'.
This project will no longer be hosted at those locations.
Update RGG and RGG-TestingData repository URLs

The repositories will now be located on Github.
superbuild: Drop unused 'cmb' and 'smtk' project versions
Rename old README.txt to BUILD.txt

It contains information for those wishing to build RGG.
Rename it to make room for a more general README.
Add placeholder README
Merge pull request #1 from judajake/Version1.0

Version1.0