Merging various fixes and improvements#269

Merged

tannergooding merged 16 commits intomainfrom release/v12.0.0

Sep 24, 2021

+201-49

Commits on Aug 26, 2021

Configure ClangSharp for 12.0.0 release
tannergooding
committed

Commits on Sep 4, 2021

Ensure we look through parens when handling sizeof exprs
tannergooding
committed

Commits on Sep 22, 2021

Update Directory.Build.props
tannergooding
authored

Commits on Sep 24, 2021

Fixing some tests and simplify when casts are inserted for character literals
tannergooding
committed