Multicast, improvements, bug fixes#64

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RandDruid wants to merge 5 commits intoBogdanovKirill:masterfrom

RandDruid:master

Commits on Oct 20, 2019

Multicast, improvements, bug fixes:
andrew
committed
UnitTests updated
andrew
committed

Commits on Oct 21, 2019

Support for IPv6 and mixed IPv4&IPv6 addresses in multicast group functions
andrew
committed

Commits on Oct 23, 2019

When joining Source Specific Multicast group Receiver to Sender UDP packets are sent to unicast IP of source (rfc5760)
andrew
committed

Commits on Nov 29, 2021

Fixed error with padding of RtcpSdesPacket
andrey
committed