Refactors git models & parsers

Adds full git status parsing
Adds git status info into status quick pick
Switches to async/await in file blame/log

src/git/gitUri.ts

@@ -87,9 +87,9 @@ export class GitUri extends Uri {
 }
 
 export interface IGitCommitInfo {
-    sha: string;
-    repoPath: string;
     fileName: string;
+    repoPath: string;
+    sha?: string;
     originalFileName?: string;
 }