Fixed undefined references from libvpx.so in toxav_basic_test
Initialize codec session with right values.

Audio decoder and encoder channel values are sepparate values, the
decoder should be set to the number of channels the other peer has
his encoder set.
Reduced max size of queue.
Fixed segfault.
Spreading packets around TCP relays causes issues with the audio and video.

Make each connection stick to the same relay.
Size parameter is now checked in toxav_send_audio().

Cleaned up code a bit.
Fix test_many_clients in tox_test

Stack variable to_comp goes out of scope,
but a reference to the variable is used later
in Fiend_Requests.