Makes git flags type safe

Cleans up navigation key support for git commands
Changes search git command to show a quick pick menu of commit commands
Adds navigation key support to search git commands to reveal commits
Removes incorrect multiselect of repos in search git command
Adds navigation key support to stash git commands to reveal stashes
Changes stash list git command picker to stay in context
Changes Show In View to be Open in Search Commits View
Changes Show In View to be Open in File History View
Adds Reveal in Repositories View command in commit quick picks
Changes commit quick pick commands (ordering, descriptions, etc)
Adds progress notification to revealCommit & reveal parent walking
Changes findNode to use a loop & canTraverse callback & adds cancelation
Changes findCommit to search for commit in all branches

Adds left arrow to go back if there is no text value

Attempts to open the commit/stash in Repositories view if possible

Adds alt tokens for each search by
Adds message: token
Adds double quote support for word boundary

Occurs when opened directly with a repo

Hoping to reduce strange issues with watch

Closes #410 - adds ability to search by multiple criteria
Adds ability to match case, match all, & use regex

Fixes issue with wrong diff line with previous
Fixes issues with previous/next when on right/left side of diff editor