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/models/log.ts

@@ -0,0 +1,14 @@
+'use strict';
+import { Range } from 'vscode';
+import { IGitAuthor } from './commit';
+import { GitLogCommit } from './logCommit';
+
+export interface IGitLog {
+    repoPath: string;
+    authors: Map<string, IGitAuthor>;
+    commits: Map<string, GitLogCommit>;
+
+    maxCount: number | undefined;
+    range: Range;
+    truncated: boolean;
+}