Merge pull request #3681 from Mailaender/overlays

Added WithIdleOverlay Render Trait
remove unused artwork
give the d2k tower rockets an angle

as the turrets points upwards
remove sandworm test that did not work out
move Tooltip into it's own CS file
remove failed experiment with fundaments
adjust the d2k production palette icon width to 60 again
adjust the d2k timer position a little