Make sure actors are removed from control groups when captured

Fixes #5976.
Fix mouse event filtering in BackgroundWidget.
Allow ImageWidget to filter mouse events.
Fix mouseover filtering in cloned widgets.
Hide invalid hotkey from button tooltips.
Move TD production widgets into the RA project.
Don’t crash if there are no production icons. Fixes #5543.
Extract ProductionPalette background drawing into logic code.
Add support for single-line time display.
Split the last TD UI logic into reuseable chunks.
Unify cheats -> debug and adjust plumbing for new RA UI.
Make the diplomacy panel consistent with cheats and menu.
Support fading the area behind the radar to black.
Blink the power display red when low power.
Add a logic class for faction-specific backgrounds.
Move SupportPowersWidget into RA and generalize.
Move ProductionQueueFromSelection into RA and generalize.
Support trimmed production icon rectangles.
Add icon glyphs for naval, powerdown and diplomacy (for use in RA).
Split TS ingame chrome.