Modify addressing to allow only 2 byte node address.
Allow modifying the node address by modifying the ipv6 address
(the ipv6 address has a direct relation with the node address)
Introduce the option to add a 4 byte random number to the mac header
as a preparation for ciphered data exchange.
Introduce a FCB (frame control byte) as a replacement for the INFO
field in the mac header.
Update esp32-devkitc:espnow config to reflect address size change.
Update the documentation to reflect address size changes.
Signed-off-by: Laczen JMS <laczenjms@gmail.com>
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