Switches to use HoverProvider for hovers in file blames

Optimizes annotation computation (cache by commit)

Adds openChangedFileChangesWithWorking to custom view
Removes unneeded context checks from custom view commands

Removes branch remote commands if not tracked

Updates to latest vscode engine

Adds setting to show remote tracking branch in custom view

Adds Open Repository in Remote command to the Remote custom view items

Adds Open File in Remote command to History custom view item

Adds Open Branches in Remote command to the Branches custom view item
Adds Open Repository in Remote command to the Repository Status custom view item

Updates custom view when repo changes (brute force for now)

Adds Stash Changes command to SCM view items

Updates dependencies

Adds message when there are no stashes
Cleans up the stash explorer

Adds "progress" state to file annotation command

Fixes #118 - stopped working on latest insiders build

Adds stash explorer toggle command