- fix trigger:
- update image in case a trigger was set below a stone which
gets deleted before level initializtion-
- hollow puzzles should press trigger
- fix odometer: missing template object
- fix dummy item: typo in template object
- fix group - objects occuring twice in a group did cause false result groups,
especially the join group operator has been affected
- fix volcano: broken images due to fart -> quake renaming
- fix crash on grp:nearest(obj) in case obj is no longer existing - now an
assetion is thrown
