Improved AppCastMaker and AppCastMakerTests

[melsawy93]

Items copied from (https://github.com/NetSparkleUpdater/NetSparkle/pull/581): Tries to get SemVerLike compat into the app cast generator

• [x] Works for assembly versions
• [x] Works for manual --file-version
• [x] Fix comparisons so everything looks at SemVerLike objects
• [ ] Add unit tests
• [x] 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.
• [x] 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

[melsawy93]

@Deadpikle for the Add unit tests and CanMakeAppCastWithAssemblyData items, whats left?