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.

Resources/Textures/Objects/Tools/appraisal-tool.rsi/meta.json

@@ -0,0 +1,14 @@
+{
+   "copyright" : "Taken from https://github.com/tgstation/tgstation/blob/master/icons/obj/device.dmi state export_scanner at commit 7544e865d0771d9bd917461e9da16d301fe40fc3.",
+   "license" : "CC-BY-SA-3.0",
+   "size" : {
+      "x" : 32,
+      "y" : 32
+   },
+   "states" : [
+      {
+         "name" : "icon"
+      }
+   ],
+   "version" : 1
+}