Now makeEffect boilerplate requires datum to implemt PTryFrom

It will free `makeEffect` from using `unsafeCoerce` and force each
effect datums to implement their own "parsers".

agora.cabal

@@ -123,6 +123,7 @@ library
   exposed-modules:
     Agora.AuthorityToken
     Agora.Effect
+    Agora.Effect.NoOp
     Agora.Governor
     Agora.MultiSig
     Agora.Proposal
@@ -151,11 +152,11 @@ test-suite agora-test
   main-is:        Spec.hs
   hs-source-dirs: agora-test
   other-modules:
+    Spec.AuthorityToken
     Spec.Model.MultiSig
     Spec.Sample.Stake
     Spec.Stake
     Spec.Util
-    Spec.AuthorityToken
 
   build-depends:  agora