Change "ss" diff flag to an enum

This will allow us to introduce a new "stat only" diff mode without
needing an explosion of mutually incompatible flags.

The old "ss" query parameter is still accepted in order to avoid
breaking saved links, but we no longer generate any URIs using it;
instead the new "dt" (diff type) parameter is used.

Signed-off-by: John Keeping <john@keeping.me.uk>

ui-shared.c

@@ -346,9 +346,9 @@ void cgit_commit_link(char *name, const char *title, const char *class,
 		html_url_arg(rev);
 		delim = "&";
 	}
-	if (ctx.qry.ssdiff) {
+	if (ctx.qry.difftype) {
 		html(delim);
-		html("ss=1");
+		htmlf("dt=%d", ctx.qry.difftype);
 		delim = "&";
 	}
 	if (ctx.qry.context > 0 && ctx.qry.context != 3) {
@@ -402,9 +402,9 @@ void cgit_diff_link(const char *name, const char *title, const char *class,
 		html_url_arg(old_rev);
 		delim = "&";
 	}
-	if (ctx.qry.ssdiff) {
+	if (ctx.qry.difftype) {
 		html(delim);
-		html("ss=1");
+		htmlf("dt=%d", ctx.qry.difftype);
 		delim = "&";
 	}
 	if (ctx.qry.context > 0 && ctx.qry.context != 3) {