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

further rework of MapConfigViewController, lists missions correctly (they don't load fine yet)

move all preview drawing code into its own class (for a simplified and more readable MapConfigViewController)