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.

util-lib: split out allocation calls into alloc-util.[ch]

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.

property callback returns are consistent It is no different to return 0 over 1 in the property callback. It is confusing to return 1 which made me think 1 has a special purpose. This way code is consistent with the rest of the tree.

remove unused includes This patch removes includes that are not used. The removals were found with include-what-you-use which checks if any of the symbols from a header is in use.

net: support globbing and disjunction in Match logic Match{Name,OrginalName,Type,Driver,Path} can now take a space-separated glob of matches.

networkd: bus - expose MatchMAC

networkd: network-bus - use sd_bus_path_{en,de}code

networkd: add basic org.freedesktop.network1.Network interface