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/PriceGunComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Server.Cargo.Components;
+
+/// <summary>
+/// This is used for the price gun, which calculates the price of any object it appraises.
+/// </summary>
+[RegisterComponent]
+public sealed class PriceGunComponent : Component
+{
+
+}