Synth camera

Allows the AI and borgs (but not drones) to take photos and share with the station.
Taken pictures can be printed through a photocopier and attached to newsfeeds.

* An AI and all borgs slaved to it share photos.
* Different AIs (and respective borgs) will not have access to each others photos.
* AI-less borgs store their images locally and cannot currently directly share them with other borgs.
* AI-less borgs which are slaved upload any local photos to their new master (while keep their local copies). Remote photos are not downloaded for local use.
* Slaved borgs always directly upload new photos to their master, skipping local storage.
* Slaved borgs which are un-slaved lose access to the remote repository and revert to local use.
* Slaved borgs are currently unable to delete remote photos, even their own. This is up to the master.
* Borgs can however always delete their local photos, if any.
* Borgs must have a functional camera to be able to take pictures.

Mostly based on the tg-station version and a current PR, with some restructuring.