Rework tab bar into patch controls / handle

[robobenklein]

Extra controls that appear when the pane is active need to be overwritten / replaced or just removed altogether to make room since they will not function after VSCR changes.

[robobenklein]

Or another idea, delete the tabs entirely and expand the breadcrumbs into the full controls for the patch, since the breadcrumbs already include filename, and also emphasize smaller code fragments per patch which Atom's CR was not very good at.