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.
When a tab was being deleted, for instance, the last block that got
deleted would cascade to delete its parent tab, even though the
`DeleteTab` function was already going to do this. This would produce DB
collisions that would put the app into a bad state. Now we pass a
`recursive` flag that is used to determine whether to perform the
recursive close of the parents.
Also updates `DeleteWorkspace` so that named workspaces will always be
deleted if they're empty, even if `force` is false
Updates `DeleteBlock` to close its parent tab if the tab has no more
blocks. This will also cascade to close the workspace if it no longer
has any tabs, same for window.
I had to move some block-related functionality around on the backend.
There was a bug in main-server where we were returning Window from
EnsureInitialData and then overwriting the layout on the active tab. The
return values from this function are unclear. Some of the initial data
was being set in the wcore.EnsureInitialData and some was being set in
main, so I've moved all the logic into EnsureInitialData and now it just
returns error.
