libtorc-audio: Sundry cleanup

- cleaner planar format handling
- don't use deprecated/removed max audio frame size
- remove unnecessary frame reset
libtorc-audio: Tweak TorcRAOPBuffer timeout
libtorc-audio: Tweak TorcRAOPDevice logging
libtorc-audio: TorcRAOPConnecton fixes

- incorrect modulus calcs lead to incorrect debugging and short timeouts
- fix iTunes sending more challenge requests