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, 4 insertions, 3 deletions

diff --git a/src/test/test-copy.c b/src/test/test-copy.c
index a03a68bd43..000d407db1 100644
--- a/src/test/test-copy.c
+++ b/src/test/test-copy.c
@@ -20,13 +20,14 @@
 #include <unistd.h>
 
 #include "copy.h"
-#include "path-util.h"
 #include "fileio.h"
+#include "macro.h"
 #include "mkdir.h"
+#include "path-util.h"
+#include "rm-rf.h"
+#include "string-util.h"
 #include "strv.h"
-#include "macro.h"
 #include "util.h"
-#include "rm-rf.h"
 
 static void test_copy_file(void) {
         _cleanup_free_ char *buf = NULL;