Get TH stuff working

Slows build down quite a bit though :(

elm.cabal

@@ -45,6 +45,9 @@ Executable elm
         builder/src
         ui/terminal/src
 
+    other-extensions:
+        TemplateHaskell
+
     Main-Is:
         Main.hs
 
@@ -226,6 +229,7 @@ Executable elm
         containers >= 0.5.8.2 && < 0.6,
         directory >= 1.2.3.0 && < 2.0,
         edit-distance >= 0.2 && < 0.3,
+        file-embed,
         filepath >= 1 && < 2.0,
         ghc-prim,
         haskeline,