Closes #209 - Open File in Remote should ask for a branch if no upstream

Also adds icons for prev/next and places them into the editor toolbar

See https://github.com/Microsoft/vscode/pull/46102

Fixes duplicate upstream node issue
Fixes results explorer node refreshing

Splits currentLineController into:
lineAnnotationController - end of line annotation
lineHoverController - hovers to current line(s)
statusBarController - blame on the statusbar

Fixes open file, open revision, & show file history

Supports toggling annotations for each file individually or all files at once
Closes #289

Adds custom label support to result view

Fixes settings migration

Uses import() for copy/paste and tmp

Since git log --follow drops merges, -m --first-parent adds them back

Tweaks the blame animation
Fixes issues with blame and the active editor

Adds repo name to results if there is more than 1

Removes range because it is unnecessary

Adds new getLogCommit
Adds getRecentLogCommitForFile
Renames getLogForRepo to getLog
Renames getLogForRepoSearch to getLogForSearch

Adds a static "container"
Adds a document tracker - replaces the context tracker
Adds a line tracker
Refactors all the things - better performance, lower overhead, less code, more separation of concerns, more maintainable (hopefully)
Changes dirty blame to only happen after a "idle" delay
Closes open file annotations on edit (too expensive to track changes)