[MAP] Minor Map Changes

The conclusion of this: https://github.com/tgstation/-tg-station/pull/4973

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Assistant spawns have been returned to their original status. I'll leave the randomization to the people who want to code a proper random system.

Everything that is being changed.

* The Research and Development Room now has two Privacy Shutters in the southern entrance, to replace the removed tinted windows. The door is not blocked when the shutters are down.

* 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, bug fixes and all that jazz.

* Add myself to the admin's list for convenience.

* Execution Room changed in design and usage, gas chamber is now a electric chair. The chair itself needs to be assembled but all needed components are present. This is to prevent errors associated with a preset electric chair.

* AI Satellite Maint room has a motion-sensitive camera.

* Hand Labeller added to the Warden's Office.

* Two fire extinguishers in the brig (I failed to mention this change from the start).

* Fixed the lighting issue in Tech Storage

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I have other minor things I want to do, but I'll leave those for another day. I just want this PR pushed through. 

These PR's have been up for a total of 15 days, I hope that is sufficient. Other people want to make map changes.