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/Systems/PriceGunSystem.cs

@@ -0,0 +1,37 @@
+using Content.Server.Cargo.Components;
+using Content.Server.Popups;
+using Content.Shared.Interaction;
+using Content.Shared.Timing;
+using Robust.Shared.Player;
+
+namespace Content.Server.Cargo.Systems;
+
+/// <summary>
+/// This handles...
+/// </summary>
+public sealed class PriceGunSystem : EntitySystem
+{
+    [Dependency] private readonly UseDelaySystem _useDelay = default!;
+    [Dependency] private readonly PricingSystem _pricingSystem = default!;
+    [Dependency] private readonly PopupSystem _popupSystem = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<PriceGunComponent, AfterInteractEvent>(OnAfterInteract);
+    }
+
+    private void OnAfterInteract(EntityUid uid, PriceGunComponent component, AfterInteractEvent args)
+    {
+        if (!args.CanReach || args.Target == null)
+            return;
+
+        if (TryComp(args.Used, out UseDelayComponent? useDelay) && useDelay.ActiveDelay)
+            return;
+
+        var price = _pricingSystem.GetPrice(args.Target.Value);
+
+        _popupSystem.PopupEntity(Loc.GetString("price-gun-pricing-result", ("object", args.Target.Value), ("price", $"{price:F2}")), args.User, Filter.Entities(args.User));
+        _useDelay.BeginDelay(uid, useDelay);
+    }
+}