Implements item pricing, and piracy. (#8548)

* Start implementing item pricing.

* Flesh out prices a bit, add the appraisal tool.

* Add prices to more things.

* YARRRRRRR

* gives pirates an appraisal tool in their pocket.

* Makes the various traitor objectives valuable. Also nerfs the price of a living person, so it's easier to bargain for them.

* Address reviews.

* Address reviews.

Content.Server/Cargo/Components/CargoConsoleComponent.cs

@@ -1,3 +1,4 @@
+using Content.Server.Cargo.Systems;
 using Content.Server.Power.Components;
 using Content.Server.UserInterface;
 using Content.Shared.Cargo;