New Feature: wildcards in mac-address

[tintinmaster]

You can use "**" at every 8-bit block in the mac-address to act as a wildcard.

I implemented this, because my range extenders are changing the mac addresses of devices to begin with the range extender one, and with wildcards I can have only one entry per device and still get info about it wherever it is located in the network.

If you look at this during October 2020, could you hacktober-accept it, pls?