atc_communications: initial prototype of channel 9 availability

Signed-off-by: diditclear <didyourupgradeclear@gmail.com>
welcome: add basic welcome controller

Signed-off-by: diditclear <didyourupgradeclear@gmail.com>
atc_communications: fix various little glitches

Signed-off-by: diditclear <didyourupgradeclear@gmail.com>