util-lib: split our string related calls from util.[ch] into its own file string-util.[ch]

There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.

This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.

Also touches a few unrelated include files.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/test/test-conf-files.c b/src/test/test-conf-files.c
index 01ece022c1..30ba5364c4 100644
--- a/src/test/test-conf-files.c
+++ b/src/test/test-conf-files.c
@@ -19,14 +19,15 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <stdio.h>
 #include <stdarg.h>
+#include <stdio.h>
 
 #include "conf-files.h"
 #include "macro.h"
+#include "rm-rf.h"
+#include "string-util.h"
 #include "strv.h"
 #include "util.h"
-#include "rm-rf.h"
 
 static void setup_test_dir(char *tmp_dir, const char *files, ...) {
         va_list ap;