Add "/ncp version" command.
Change the way morepackets(vehicle) teleports player and vehicle.

Player gets ejected, then both teleport then re-enter. Includes some
sanity checks. Also should work for players exiting vehicles. Might
conflict with Worldguard region flags and similar. [Missing: proper
treatment of vehicle-enter/exit.]
Cleanup for all added components, reorder cleanup on disable.
Fix last damage-tick by entity attack being reset while dead, renamings.
Fix morepackets(vehicle) set back never executing.