ModelDoc loads addon FGDs too
Moved model_archetypes from a helper into metadata
This prevents the game from complaining about missing helper factory without hacks, and it makes more sense to store this in in metadata anyway.
Minor housekeeping changes to entities
Added PathPlatformEntity.OnAlreadyThere. It and OnMovementEnd now give current position as parameter
Added LogicEntity (ent_logic), which encompasses logic_auto, logic_relay and logic_compare