Adds musical sfx to Nuke Ops Bard and enables it to be chosen in Syndicate Weapons Vendors.

[Gannets]

About the PR

This PR adds a series of metal guitar sound effects (by discord user Aquario) to the various bard abilities.
Azrun helped with the playsound code, currently sfx overlap and create a dissonant cacophony. It's great.
This PR also enables the bard class crate to be chosen in nuke ops rounds.

Why's this needed?

It's time to get bard out the door, it's fun to play, looks good now and is about to get loud. So let's go!

Changelog

(u)Azrun, Gannets & Aquario
(*)Adds the Bard class crate to Cairngorn Syndicate Weapons Vendors.
(*)The bard is equipped with: A stylish flying V guitar which does decent damage to humans and considerably more to airlocks.
(*)Two amplifier stacks, which can be worn on the back slot, which serve as the center of any area of effect skills you play.
(*)A variety of instant use abilities and extended play support effects to boost your team's performance.
(*)Tip: strum along to your songs to keep them going longer!

[Gannets]

Azrun has a fix for the overlapping audio, so I'll grab thst before I merge this.