Adds support for git commands on scheme=git

Rewrites blame annotation controller and provider - fixes whitespace issues, reduces overhead, and provides better performance
Rewrites status bar blame support - reduces overhead and provides better performance
Adds showFileHistory command to status bar
Renames showHistory to showFileHistory
Fixes log to use iso 8601 for dates

src/system.ts

@@ -1,3 +1,4 @@
+'use strict';
 // export * from './system/array';
 // export * from './system/disposable';
 // export * from './system/element';