gg: image: return an optional instead of panic(); darwin: fix nsstring()

vlib/builtin/builtin.v

@@ -113,11 +113,27 @@ pub fn print(s string) {
 const (
 	new_line_character = '\n'
 )
+
+//#include "@VROOT/vlib/darwin/darwin.m"
+
+//fn C.nsstring2(s string) voidptr
+//fn C.NSLog(x voidptr)
+#include <asl.h>
+
+
+fn C.asl_log(voidptr, voidptr, int, charptr)
+
 pub fn println(s string) {
 	$if windows {
 		print(s)
 		print(new_line_character)
 	} $else {
+		// For debugging .app applications (no way to read stdout) so that it's printed to macOS Console
+		/*
+		$if macos {
+			C.asl_log(0, 0, C.ASL_LEVEL_ERR, s.str)
+		}
+		*/
 		//  TODO: a syscall sys_write on linux works, except for the v repl.
 		//  Probably it is a stdio buffering issue. Needs more testing...
 		//	$if linux {