Tweak height limit of air attack in bounce edge maps

Disallow placement of piano beyond bounce world edge

Deny air attack in bounce world edge if target is in "impossible" position

Don't try to spawn air mines beyond the bounce world edge

Bounce off gears at bouncy world edge only if they move towards it

Frontend: Tweak button padding once more

Mention zoom key in movement training

Fix wrong ice beam angle if it goes diagonally up out of map thru world wrap (bug #718)

Frontend: More button padding tweaking

TS: Restore 2 of the "specialist" letters

merge release branch

tabs to spaces

deletegear rearrangement applied to branch too. if this causes desyncs you're probably in a crashy state already

couple more use after frees for gear deletion. also rearranged lines a bit and added a redundant exit to try to proof things a bit. more evidence we need rust.

Make sure to render crosshair above render