More things added to communication menu and ground services

[Kibukaj]

I'd like to see stuff like radio checks (for people who don't use simple communications), and ground services. Ground services in particular. Pushback would be nice (so you can park in front of a wall and then be able to start again), and the repair function fixed, because ironically, it is broken. I had more stuff in mind but it's at the tip of my tounge so i'll post what I thought of now.