refactor(stdlib)!: Change readFile to return String rather than ELi…

…st<String>

BREAKING CHANGE: stdlib signature changed

jvm-stdlib/elara/IO.java

@@ -31,10 +31,10 @@ public static IO<Unit> println(String s) {
         });
     }
 
-    public static IO<EList<String>> readFile(String path) {
+    public static IO<String> readFile(String path) {
         return new IO<>(() -> {
             try {
-                return EList.fromList(Files.readAllLines(Paths.get(path)));
+                return new String(Files.readAllBytes(Paths.get(path)));
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }

prim.elr

@@ -44,7 +44,7 @@ let empty = elaraPrimitive "empty"
 def (|>) : a -> (a -> b) -> b	
 let (|>) a f = f a	
 
-def readFile : String -> IO [String]
+def readFile : String -> IO String
 let readFile = elaraPrimitive "readFile"
 
 def ioBind : IO a -> (a -> IO b) -> IO b