Added a test for the Wondrous painting thing

worlds/lingo/utils/validate_config.rb

@@ -39,6 +39,7 @@
 mentioned_panels = Set[]
 mentioned_sunwarp_entrances = Set[]
 mentioned_sunwarp_exits = Set[]
+mentioned_paintings = Set[]
 
 door_groups = {}
 
@@ -257,6 +258,12 @@
       unless paintings.include? painting["id"] then
         puts "#{room_name} :::: Invalid Painting ID #{painting["id"]}"
       end
+
+      if mentioned_paintings.include?(painting["id"]) then
+        puts "Painting #{painting["id"]} is mentioned more than once"
+      else
+        mentioned_paintings.add(painting["id"])
+      end
     else
       puts "#{room_name} :::: Painting is missing an ID"
     end