Already done:

- 2nd frame of Yak shp (north-north-west) no longer uses greyscale instead of remap for the tail fins.
- Mobile Gap Generator finally has a shadow.
- Medium Tank barrel length increased by ~1-2 pixels (depends on angle).
- Light Tank barrel significantly shortened and thinned, to better refelct its low damage per shot.
- airfield now uses all 8 frames for flag anim and active anim.
- airfield house/tower had some see-through pixels (terrain was visible), which was unrealistic due to its angle. Filled these with shadow.
- Gap Generator now has some shadow.
- FRAG1 and FBALL1 explosions are now a bit more centered.
- wood crate received a shadow and was converted to the correct palette.
- silver crate now has a shadow, too.
- fixed some minor errors on Harisson's silo, moved it up by 1 pixel and added some shadow.
- Construction Yard got some shadow on the edges to better fit in line with the other buildings.
