Combine pa_raop_client_new and pa_raop_client_connect (no point in having them separate)

Combine pa_raop_client_new and pa_raop_client_connect (no point in having them separate)

Convert the iochannel to an fd and do not call a pa_iochannel_cb_t callback but rather trigger the callback on connection and pass the fd.
Change pa_raop_client_send_sample to pa_raop_client_encode_sample and work with memchunks.
Fix a subtle size bug in the bit writer that techincally isn't triggered in normal operation.
Clean up the _free function to actually free stuff.
Do the actual ALAC encoding.

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/coling@2394 fefdeb5f-60dc-0310-8127-8f9354f1896f