implements `wsh run` command. lots of fixes (and new options) for command blocks. cleans up the UX/UI for command blocks. lots of bug fixes for blockcontrollers. other minor bug fixes.
also makes editor:* vars into settings override atoms.
The migration tool we used didn't take into account our formatting
standards so I'm bulk-formatting the SCSS files to bring them back up to
our standards. Basically this just changes the tab size for all the
files.
