Json AST: Adding 'constants' and Improving 'globals' c3lang#1540, c3lang#1541

Fixing uint64_t printf format and binary else operator

Author: cardisk

releasenotes.md

@@ -16,6 +16,8 @@
 - Improve error messages on expressions like `var $type = int;` #1553.
 - Disallow casting a `void*` to `any` or an interface, unless it is `null`.
 - Defer resolution of declarations when looked up in `def` aliased #1559.
+- Adding constants to the Json AST #1540
+- Adding info to the globals inside Json AST #1541
 
 ### Fixes
 - `Unsupported int[*] $x = { 1, 2, 3, 4 }` #1489.