[mr3032] drop usage LOCKED VehicleKitPtr (seems unneeded in current code), rework locksystem part 4. need separate test.
[mr3033] drop usage LOCKED UnitActionPtr (seems unneeded in current code), rework locksystem part 5. need separate test.
[mr3034] Implement atomic lock method in common code (FFU). thx Boxa for code.
[mr3035] fix broken "manual" invite after 3023, thx to mns.