FS-5686 --resolve mod_rayo: allow re-join to mixers so that audio direction can be changed.  Added support for audio direction in mixers.  Allow unjoin without mixer-name or call-id

FS-5682 --resolve new syntax <action application="set" data="sip_multipart=application/pidf+xml:1234"/> use push instead of set to add more to the same channel

Chrome send "Connection: Upgrade" while FF has "Connection: keep-alive, Upgrade"

like the quirks we used to get using those with C++ have gone away.

images should now be correct. This is now close to supporting grey scale and
colour.

FS-5662 --resolve implement call pickup group functionality in mod_skinny. Currently treats callPickup and grpCallPickup identically, may revisit when I find out more about what's different between the two

Thanks-to: Mariusz Czułada <manieq.net@gmail.com>

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