* Rename repos dir to repo-projects
* Move keys dir into prereqs
* Refactor Tools and tools-local dirs
* Refactor ArcadeOverrides dir
* Update .gitignore
* Initial checkin of source-build tarball build infra
* Add a couple more comments
* Update eng/SourceBuild.Version.Details.xml based on PR review
Co-authored-by: Chris Rummel <crummel@microsoft.com>
* Updates based on PR review comments
Co-authored-by: Chris Rummel <crummel@microsoft.com>