changes:
Organs now use Initialize().
The observe message now shows the configured respawn delay instead of always 30 minutes.
Seed datums no longer have a timer in New().
External organs no longer have a timer in New()/Initialize()
Converted some spawns in organs to timers.
Floor init no longer breaks to plating first for mapped in tiles.
Added the INITIALIZE_IMMEDIATE macro to make Initialize() not wait for SSatoms init.
Mannequins now use INITIALIZE_IMMEDIATE instead of a custom-defined New().
Mannequins (from get_mannequin) now delete themselves if unused for 5 minutes or longer.
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