webcamd: Improved rc.d script, much better now.

# webcamd_devices=<list of USB devices for webcamd to attach to seperated by commas and/or spaces>
# webcamd_user=<the user to run webcamd as>
# webcamd_group=<the group to run webcamd as>
# webcamd_startup_delay=<number of seconds to wait for webcamd to start before launching the next instance of webcamd>
# webcamd_flags=<set additional global webcamd flags, applied on all instances>
# webcamd_instance_{0,1,2,3}_flags=<set specific webcamd flag on additional instances, which are not started from setting $webcamd_devices>

# Examples:
# sysrc webcamd_enable=YES
# sysrc "webcamd_devices=ugen2.2, 7.3"

# sysrc "webcamd_instance_0_flags=-L 127.0.0.1:5100:-1"
# sysrc "webcamd_instance_1_flags=-d ugen7.4 -i 1 -m v4l2-dev.hflip=1"