Add implementation for sACN Multicast for Ethernet Shield#29

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dnadoba wants to merge 4 commits intoforkineye:masterfrom dnadoba:master

+66-63

Commits on Feb 4, 2020

Commits on Mar 5, 2020

add support for multiple multicast sockets
dnadoba
committed

Commits on Jan 1, 2021

add support for CORE_TEENSY
dnadoba
committed