Add "Surfer" achievement to Space Invasion. Balance "Shield Miser" in Space Invasion. Fix disappearing ghost bug in Racer Extend waypoint limit to 8 in Racer Lengthen ghost tracking interval to improve performance in Racer. Allow users to view score between turns now that HideMission() is fixed.

this seems... um.. random

Bee: + don't explode on time expiration but fall instead (still explodes on impact) * avoid side-effects by removing flag sharing between different bees.

mikade's request: dont delete mission text/texture in HideMission() (so that it can still be looked at in ESC menu

fix HideMission()

don't hide target cursor if a hedgehog (other than current) is drowning, thanks to mikade for pointing this out

unified the objc game state in a single place, which allowed some optimization to ObjcExport class (and more)