Rename "compiler" functionality to Evaluator

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

test/Spec.hs

@@ -1,7 +1,7 @@
 module Main where
 
-import Compiler
 import Eval
+import FileEval
 import Lexer
 import Library
 import Parser
@@ -31,7 +31,7 @@ tests = testGroup "Tricu Tests"
   , evaluationTests
   , lambdaEvalTests
   , libraryTests
-  , compilerTests
+  , fileEvaluationTests
   , propertyTests
   ]
 
@@ -377,8 +377,8 @@ libraryTests = testGroup "Library Tests"
       result env @?= Stem Leaf
   ]
 
-compilerTests :: TestTree
-compilerTests = testGroup "Compiler tests"
+fileEvaluationTests :: TestTree
+fileEvaluationTests = testGroup "Evaluation tests"
   [ testCase "Forks" $ do
       res <- liftIO $ evaluateFile "./test/fork.tri"
       res @?= Fork Leaf Leaf
@@ -388,7 +388,7 @@ compilerTests = testGroup "Compiler tests"
   , testCase "Mapping and Equality" $ do
       res <- liftIO $ evaluateFile "./test/map.tri"
       res @?= Stem Leaf
-  , testCase "Map evaluation to String -> compilation -> string decoding" $ do
+  , testCase "Eval and decoding string" $ do
       res <- liftIO $ evaluateFile "./test/string.tri"
       decodeResult res @?= "String test!"
   ]

test/assignment.tri

@@ -0,0 +1 @@
+x = t (t t) t