Add color swappers, color swapping, and color targets.

mods/artifact_base/init.lua

@@ -5,7 +5,13 @@ artifact = {
     -- This toggles a lot of things, including whether initialization takes place,
     -- whether nodes can be pointed, and whether the player is permitted to
     -- bypass certain restrictions imposed by the story.
-    debug = true
+    debug = true,
+    colors = {
+        gold = "#faf17a",
+        red = "#e94f3f",
+        green = "#6aae68",
+        blue = "#789fd8"
+    }
 }
 
 -- For brevity.