Fix #571: Footer broken on RTD site
Remove stuff that's not needed for the theme
Update copyright

The copyright in the build configuration file shows in the default
footer.
Hide default footer in docs by hiding default copyright

The default footer only consists of the copyright statement, so we
can get rid of the footer by not showing the copyright.

Instead we show a custom footer thanks to @umcsdon.
Different Recording UI layout; Persistent buttons
Delete empty files on stop
 Icon only buttons; All custom icons; Disable leave recording mode on record
No system icons, use only custom; Removed "Prepare to record" icon
Record button no longer needs to maintain state

Previously, the stop button would look pressed
because the state was needed for operation.
This state is now being maintained by a
separate variable.
Renamed buttons
New button styles
Moved auto-record feature to menu