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.

resolved: set a description on all our event sources

resolved: fix error propagation

resolved,networkd: unify ResolveSupport enum networkd previously knew an enum "ResolveSupport" for configuring per-interface LLMNR support, resolved had a similar enum just called "Support", with the same value and similar pasers. Unify this, call the enum ResolveSupport, and port both daemons to it.

resolved: improve some log messages a bit Indicate thar we ignore invalid messages

resolved: llmnr, mdns: simplify error handling sd_event_add_io() returns the error directly and does not mess with errno.

tree-wide: sort includes Sort the includes accoding to the new coding style.

util-lib: split out fd-related operations into fd-util.[ch] There are more than enough to deserve their own .c file, hence move them over.

resolved: use a #define for LLMNR port De-duplicate some magic numbers.

resolved: move LLMNR related functions into separate file