paipairing

Stuff
That computer is horrendous

Still doesn't work properly for AI. Probably never will.
Back to qdel()

Sorry
Arcades, overlays and Git being evil

Added the most important damn checks of this entire PR that got eaten by
Git when I synced
Added a visual indication of a pAI being paired with a computer - a tiny
blue light at the bottom
Forbid to pair with computers that have non-standard icons, except the
arcade machine.
When the arcade is emagged, if the pAI loses, it will explode like a
detonated PDA. If it's slotted into a PDA, it will explode with it.
Severs connection if the pAI and the computer are on different z-levels
More sanity checks

pAI interface is weird, let's make sure we're always in a valid state
Merge pull request #1 from Alek2ander/master

Move code to place