Bugfixes and minor cleanup

Fixed a bug in CLI where the render subregion mask would get clobbered when rendering a subregion, but not initialized when rendering the full map
Fixed a bug in GUI where the render subregion mask would be clobbered when rendering a subregion
Removed some extraneous imports in AbstractControlDescriptionProvider

Signed-off-by: Sukasa <nick.m@shaw.ca>