Fixed planes

planes and errors

Further improved unit spawning code
Special forces now despawn after time
Fixed ordnance drop plane starting from ground (may affect other planes)

Fixed group did not respawn when no enemies near
Other changes

Fixed IFA planes not getting velocity at dedi server

Fixed some mods spawned infantry instead of vehicle for moving
No more waypoints on water

Added mission parameter for disabling the estimated maximum army size (under "Performance")
Added machinegun placing trait
Other small tweaks

Groups no longer move if static weapons are deployed
Groups will redo their waypoint if unable to move on the current one
Fixed IFA3 paradrop
Other small changes

Fixed IFA planes not getting airspeed at spawn

New flags and markers with IFA3
Fixed missing vehicle errors with mods