C channels update and more ACARS messages

Changes

More ACARS message support thanks to Tomasz
8400bps channels use a raised cosine weighting for locking.
8400bps channels use large complex fasrfir RRC filter before the mixer shifted to the approxmate place of the signal.
RRC filter for 8400bps channels is 0.6 rather than 1.0.
Slowed frequency agility of 8400bps signals.
Added detection for stable non carrier detected states.
Added AES and GES to the audio file logging names when availible.
Delete audio files less then than 10k.
Changed audio logging timeout to 2 secs.
Reduced 8400bps symbol resonator from 35hz to 10hz.
Allowed shifting 8400bps carrier to go less than 4200Hz.
24000Hz bandwith locking just for fun.
Optimized 8400bps sample times better.
Removed beep from C-Channel assignment.