Add implicit foralls for bidir, update and unify pipeline

sample-programs/basic-0.crf

@@ -0,0 +1,20 @@
+data Bool () where
+    True  : Bool ()
+    False : Bool ()
+
+not x = case x of
+    True => False
+    False => True
+
+even : Int -> Bool ()
+even x = not (odd x)
+odd x = not (even x)
+
+main = case even 64 of
+    True  => 1
+    False => 0
+
+
+
+
+