Added support for draggable BackgroundWidgets
build palette hotkeys require ALT modifier to avoid conflicts

changed back the unit action hotkeys scatter / stance cycle
fix empty camo pillboxes in shellmap
allow the cloak palette to stay empty and use it for mines
Merge pull request #3011 from Mailaender/cloaking

Render mines properly again and fix empty camo pillboxes in RA shellmap
Merge pull request #3003 from Mailaender/build-palette-hotkey-modifier

Resolve hotkey conflicts between build palette and world command widget once and for all
Add Desert Shellmap
Shellmap: Add Viewport movement, coastal attacks and so forth
Shellmap: Add more Soviet buildings and improve paradrop
Shellmap: Add beginning paradrop and Tanya
Stirred up the Shellmap water because Fix Open Areas doesn't work for desert water apparently
Add general attack code to shellmap
Add civilian nudging for new shellmap
Add some awesome things to the new shellmap like Chronosphere/Iron Curtain usage and auto unloading of cargo
Adjust medium tank spawn location
Shellmap polish
Update CHANGELOG
catch everything NatUtility does so it does not crash anymore
more checks for NRE and setting to disable NAT discovery
Merge pull request #3014 from ScottNZ/shellmap

Additional shellmap for RA