Add analyzer release tracking

[MattKotsenas]

Enable analyzer release tracking (i.e. AnalyzerReleases.Shipped.md). Fixes #72.

Wokflow was as follows:

1. Download old release from NuGet
2. Open in ILSpy to view the analyzer metadata
3. Create appropriate release in AnalyzerReleases.Shipped.md
4. GOTO 1
5. Add help links pointing to our //docs/rules files
   • I tried to make the base URL a helper function, but the analyzer is unable to add documentation URLs to the Unshipped file if the URL isn't a constant. So instead I used string interpolation so at least the ID isn't repeated.
6. Use release analyzer codefix to add an unshipped section that adds help links

[rjmurillo]

LGTM. Thanks!