Rename of files, improved for handling, add cb hints

- Rename Test to Ink as main file
- Support more errors for for loops.
- Add hints to cbs

test/parse/for_i_loop.golden

@@ -0,0 +1,6 @@
+(program	
+ (fun vertex vs_main
+  [] 
+  (:= x 0) 
+  (for i : 0..10
+      (+= x 1))))

test/parse/for_i_one_liner.golden

@@ -0,0 +1,4 @@
+test/for_i_one_liner.ink:3,0: error: Unable to parse statement here. 'for' currently expects a brace-enclosed block as a body.
+    for i : 0..10 x += 2.0;
+    ^^^
+

test/parse/for_no_iter.golden

@@ -0,0 +1,9 @@
+test/for_no_iter.ink:3,9: error: Expected expression after '..'. Expected end of iterator.
+    for i : 0.. {
+		x += 2.0;
+             ^^
+test/for_no_iter.ink:3,0: error: Unable to parse statement here.
+    for i : 0.. {
+		x += 2.0;
+    ^^^
+

test/parse/if_if_if.golden

@@ -1,4 +1,4 @@
-test/if_if_if.ink:2,3: error: Expected expression after 'if'.
+test/if_if_if.ink:2,0: error: Expected expression after 'if'. Expected if condition.
     if if if 0 > 100 {
-       ^^
+    ^^