Allies 05: Add notification for when control center is captured
Allies 05: Make Iron Curtain unsellable
Allies 05: Cleanup civilian objective init
Start work on intro
Allies 05: Add camera fading, remove demo truck
Allies 05: Temp removal of widgets during intro.
Allies 05: Improve intro code, edit map, add letterbox widget
Use ScreenDesaturationPaletteEffect for cnc/allies 05 blackouts
Allies 05: Fix signal flare appearing at wrong time
Add letterbox bar moving to Allies 05
Add AdvancingTextWidget for use in Allies 05
Add Establish base objective to Allies 05 and flashing rectangle to AdvancingTextWidget