tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

journald: allow additional payload in server_driver_message The code to format the iovec is shared with log.c. All call sites to server_driver_message are changed to include the additional "MESSAGE=" part, but the new functionality is not used and change in functionality is not expected. iovec is preallocated, so the maximum number of messages is limited. In server_driver_message N_IOVEC_PAYLOAD_FIELDS is currently set to 1. New code is not oom safe, it will fail if memory cannot be allocated. This will be fixed in subsequent commit.

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.

log: move log_invalid_utf8() to log.h Also, make sure it follows the same scheme as log_syntax() does in its behaviour.

build-sys: split internal basic/ library from shared/ basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/