Implemented function pointers as parameters

tests/programs/param-order.q

@@ -1,12 +1,12 @@
 main() {
-	f(1, 2, 3, 4, 5, 6)
+	f1(1, 2, 3, 4, 5, 6)
 }
 
-f(a Int, b Int, c Int, d Int, e Int, f Int) {
-	g(f, e, d, c, b, a)
+f1(a Int, b Int, c Int, d Int, e Int, f Int) {
+	f2(f, e, d, c, b, a)
 }
 
-g(a Int, b Int, c Int, d Int, e Int, f Int) {
+f2(a Int, b Int, c Int, d Int, e Int, f Int) {
 	assert a == 6
 	assert b == 5
 	assert c == 4