Adds some money types. (#27963)

* Create currency.json
Adds two new currencies, for the free merchants and the as-yet nonexistent campus faction.
* Add a number of FM Certified Notes to shopkeeper
This makes sure the shopkeeper will have some, but the amount will vary randomly

data/json/items/generic/currency.json

@@ -0,0 +1,28 @@
+[
+  {
+    "type": "GENERIC",
+    "id": "FMCNote",
+    "name": "Merch",
+    "description": "The Free Merchant Certified Note, also known by names such as a 'c-note' or 'merch', is a currency based on old American bills.  Fifty dollar bills and larger are printed with a promissory note signed by the treasurer of the Free Merchants, along with a complex design.  The note explains that this can be exchanged for food, water, and other services through the Free Merchants in the Refugee Center.",
+    "price": 10,
+    "weight": 1,
+    "to_hit": -3,
+    "color": "white",
+    "symbol": "$",
+    "material": [ "paper" ],
+    "volume": "2ml"
+  },
+  {
+    "type": "GENERIC",
+    "id": "FlatCoin",
+    "name": "FlatCoin",
+    "description": "This is a coin that has been flattened in a novelty coin flattening machine.  The machine has been somewhat crudely altered so that the design - which appears to once have been Mickey Mouse - is overlayed with a handwritten emblem of a book.  There is some text that faintly reads 'Campus Exchange Token'.",
+    "price": 5,
+    "weight": 2,
+    "to_hit": -3,
+    "color": "brown",
+    "symbol": "$",
+    "material": [ "copper" ],
+    "volume": "2ml"
+  }
+]

data/json/npcs/NC_EVAC_SHOPKEEP.json

@@ -16,6 +16,7 @@
     "type" : "item_group",
     "id" : "NC_EVAC_SHOPKEEP_misc",
     "items":[
+        { "item": "FMCNote", "count-min": 50, "count-max": 300, "prob": 100 },
         ["vest", 40],
         ["kevlar", 15],
         ["jacket_army", 30],