feat(groups/{c,d,f,s}*): vim syntax support

Add vim modeline instructing the editor to use syntax plugin provided by apparmor.
Continuation of #392 to keep the diff list relatively short.

apparmor.d/groups/systemd/systemd-sleep-grub2

@@ -24,4 +24,6 @@ profile systemd-sleep-grub @{exec_path} {
   /dev/tty rw,
 
   include if exists <local/systemd-sleep-grub>
-}
+}
+
+# vim:syntax=apparmor