feat: add **opts to make inheritance a bit easier

lib/comfpile/artefact.rb

@@ -47,7 +47,9 @@ module Comfpile
         # Meta-States exist:
         # - in_progress/completed: Anything but/Only succeeded, skipped, failed
 
-        def initialize(core, engine, stage, target)
+        def initialize(core, engine, stage, target, **opts)
+            raise ArgumentError, "Unknown options supplied!" unless opts.empty?
+
             @core = core
             @engine = engine