patch 9.1.0828: string_T struct could be used more often

Problem:  string_T struct could be used more often
Solution: Refactor code and make use of string_T struct
          for key-value pairs, reformat overlong lines
          (John Marriott)

closes: #15975

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    828,
 /**/
     827,
 /**/