Expands CLI support with output forms and decoding

Adds CLI options for compiling to a Tree Calculus, AST, Ternary, and
ASCII tree view. Adds CLI command for attempted decoding of a compiled
result to Number/String/List.

src/Parser.hs

@@ -296,4 +296,3 @@ showError (FancyError offset fancy) =
 showError (TrivialError offset Nothing expected) =
   "Parse error at offset " ++ show offset ++ ": expected one of "
   ++ show (Set.toList expected)
-