Show "incompatible version" message instead of "no such room" on try to join room with another protocol version

fix for regression issue #669 "Lobby: User context-menu of offline user shows all options as if user was still online"

small cleanup etc

don't show 'follow' entry for players that are in lobby

regression fix: reallow offline players to be added to friendslist/ignore list

fixing position of spawning sparkles of target gears by applying a filthy workaround for a filthy bug in the filthy filthy doStepCase handler. please read issue #721 ps: filthy.

whip: visual enhancements (hat'n'dust) as suggested by nemo