Move ttf dumper to a module

fountainhead.cabal

@@ -19,8 +19,14 @@ extra-source-files:
   CHANGELOG.md
   README.txt
 
+common dependencies
+  build-depends:
+    text ^>= 2.0
+
 library
+  import: dependencies
   exposed-modules:
+    Graphics.Fountainhead.Dumper
     Graphics.Fountainhead.Parser
     Graphics.Fountainhead.PDF
     Graphics.Fountainhead.Type
@@ -37,15 +43,13 @@ library
     vector ^>= 0.13.0
 
 executable fountainhead
+  import: dependencies
   main-is: Main.hs
 
   default-extensions:
-    OverloadedStrings
     NamedFieldPuns
-    DataKinds
     DuplicateRecordFields
     ExplicitForAll
-    TypeApplications
   build-depends:
     base,
     bytestring,
@@ -53,7 +57,6 @@ executable fountainhead
     parser-combinators,
     vector,
     transformers,
-    text,
     time,
     megaparsec,
     fountainhead