Rename "compiler" functionality to Evaluator

Allows for stdin input for evaluation when no input file is provided.

src/Research.hs

@@ -45,7 +45,7 @@ data LToken
   deriving (Show, Eq, Ord)
 
 -- Output formats
-data CompiledForm = TreeCalculus | FSL | AST | Ternary | Ascii
+data EvaluatedForm = TreeCalculus | FSL | AST | Ternary | Ascii
   deriving (Show, Data, Typeable)
 
 -- Environment containing previously evaluated TC terms
@@ -122,7 +122,7 @@ toList (Fork x rest) = case toList rest of
 toList _ = Left "Invalid Tree Calculus list"
 
 -- Outputs
-formatResult :: CompiledForm -> T -> String
+formatResult :: EvaluatedForm -> T -> String
 formatResult TreeCalculus = toSimpleT . show
 formatResult FSL          = show
 formatResult AST          = show . toAST