Thief objectives overhaul

[hivehum]

added A LOT (41!) new possible thief + traitor steal objectives. additionally i made pipi one of the eligible animals for the CMO's pet objective, as she is part of that mob spawn pool.

and i also moved pipi and finfin's sprites to our file structure. and the SVS objectives.

i changed the CMO's over-ear headset objective to instead be a "collect x command headsets" objective, as the CMO already has two high profile theft targets (hypospray + portable crewmon) and there is nothing special about that headset compared to any other command headset. i suspect the upper bound on this may be too high for low-command shifts but this is something playtests will reveal.
i SUSPECT some of these may be too disruptive in practice (AI core, particle accelerator), but i think it is worth playing with

Changelog
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• add: Added dozens of new possible targets for thieves and traitors to steal.

[Darkmajia]

reviewed: i like a lot of the thief objectives, just have a few issues with some of them. i don't particularly like any of the traitor objectives, though