Correct bug in flight ceiling for birdy as well, increase clip on velocity to 1.9 (shouldn't cause problems with most collision checks still), apply clip to both + and -

Engine: * Write log files to different files in a new sub directory depending on "game mode"

merge

have engine try for a second position when map loading fails (in this way it's possible to move Missions data to any path) remove nsstringextra and implement raw dump when needed