clang-everything: -Wno-unsafe-buffer-usage

Remove some weird newlines

resource: Do initialisation up front

treewide: Check >= 0 on FDs

clang-format: Enable InsertBraces

fmt: Apply clang-format

strnull: Always bracket

has_full: Use bool type

treewide: Use static initialisation instead of memset()

treewide: Use width-specified types where possible

sd_notify: Use void return

config_get_path: Only getpwuid() when there is no base_dir

makefile: Make sure we rebuild on header changes

Open code sd_notify

clang-format: Update from pamultisink