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

The following error also caused blame not working:

> git rev-parse --symbolic-full-name my_branch@{u}
fatal: upstream branch 'refs/heads/my_branch' not stored as a remote-tracking branch

Fixes issue with new typescript
Pins node version to match vscode's version (7.9)

Fix a minor spelling mistake.

When current line blame starts off, the toggle doesn't work

Adds menu & toolbar settings to the settings editor
Adds mode setting for settings editor
Adds sticky header to settings editor