Update source control resource states in event loop

Further work should add more incrementality to support recording and amending, along with tracking when to fire onDidChangeFileDecorations.

Created by  finchie  yesterday at 07:22
IDY5SNLOFZ663OCJ2L5NZMFNJXZSGL5O22QQXR5BIV3SJ2VUQIMQC
Change contents