eventlircd: seperate udev rules and scripts and move to package 'lirc'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
lircd: start lircd via systemd, rework lircd_helper and udev rules, this should fix #2991, this should fix #2968

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