prism: Split converter into library and executable

This allows to write separate tests for the library.

copar.cabal

@@ -245,26 +245,38 @@ benchmark bench
   default-language:    Haskell2010
   ghc-options:         -Wall
 
-executable prism-converter
+library prism-converter-lib
   hs-source-dirs:      src/prism-converter
-  main-is:             Main.hs
-  other-modules:       Parser
+  exposed-modules:     Parser
                      , MarkovChain
                      , Mdp
                      , StatesFile
   default-language:    Haskell2010
   build-depends:       base >= 4.11
-                     , text
-                     , vector
-                     , megaparsec >= 7
-                     , containers
-                     , optparse-applicative
-                     , prettyprinter
-                     , prettyprinter-ansi-terminal
-                     , prettyprinter-convert-ansi-wl-pprint
-                     , microlens
-                     , microlens-th
-                     , microlens-platform
+                     , containers ^>= 0.6
+                     , megaparsec ^>= 7
+                     , microlens ^>= 0.4.10
+                     , microlens-platform ^>= 0.3.11
+                     , microlens-th ^>= 0.4.2
+                     , text ^>= 1.2.3
+                     , vector ^>= 0.12
+                     , vector-algorithms ^>= 0.8.0.1
+  if !flag(benchmark-generators)
+    buildable:       False
+
+executable prism-converter
+  hs-source-dirs:      src/prism-converter/main
+  main-is:             Main.hs
+  default-language:    Haskell2010
+  build-depends:       base >= 4.11
+                     , prism-converter-lib
+                     , containers ^>= 0.6
+                     , megaparsec ^>= 7
+                     , optparse-applicative ^>= 0.14.3
+                     , prettyprinter ^>= 1.2 || ^>= 1.3
+                     , prettyprinter-ansi-terminal ^>= 1.1
+                     , prettyprinter-convert-ansi-wl-pprint ^>= 1.1
+                     , text ^>= 1.2.3
   if !flag(benchmark-generators)
     buildable:       False