[MAP]Minor Map Changes/Assistant Spawns + Detective SecHUDs

A split of my prior PR:https://github.com/tgstation/-tg-station/pull/4854

Focusing on minor changes, I'll revisit my bar overhaul at a latter date.

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The following changes have been made
 - Assistant Spawns have been changed, now Assistants will spawn all over the station, from outside Medical, the bar to the Chapel.
 - The Research and Development Room now has two Privacy Shutters in the southern entrance, to replace the removed tinted windows.
 - The Brig entrance now has a wall mounted flasher that is activated from the entrance checkpoint. Great for crowd control and getting rid of people inside the brig.
 -  Incinerator room has as second entrance to its south, connecting the entire Maint loop.

A whole bunch of missing pipes have been removed, big fixes and all that jazz.

The Detective has been given a pair of SecHUDs in his Office. After a ingame vote, a forum vote and general discussion, this decision appears to be a positive one and one I would like to see go through.