7.7.0

Updates FSAC to 0.60.0, which updates the compiler services to match .NET SDK 7.0.300, and includes a helpful XMLDoc generation codefix. Check out the release notes for more details.
Includes fixes to the syntax highlighting from @jkillingsworth for constructor parens, the new keyword, access modifiers, arrow coloration, : in abstract member definitions, () in unit literals, and more!