Items copied from (#581):
Tries to get SemVerLike compat into the app cast generator

• Works for assembly versions
• Works for manual --file-version
• Fix comparisons so everything looks at SemVerLike objects
• Add unit tests
• Add unit tests that read off assembly version (how can we do this with unit tests when this requires a compiled binary...? probably need to do some Mock sort of something here.)
• In the CanMakeAppCastWithAssemblyData unit test, read in the app cast from disk and make sure it reads things in properly.
• Add parsing of file names off disk for SemVerLike so you can have MyApp 1.0-beta1.exe on disk and it parses correctly without breaking any of the old parsing methods (may require an additional flag if not backwards compat): Right now 1.1.0-beta.1 parses to 1.1.0.1