systemd: add debug config script and service, add avahi debug options

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: add /run/openelec to tmpfiles.d

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: start debugconfig.service after local-fs.target

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xorg-server: monitor debug.conf, start with debug logging if we start in debug mode, service files rework

Signed-off-by: Stephan Raue <stephan@openelec.tv>