Need support for "Auto Add Selected" and "Overwrite Oldest", plus "Favorite" contacts

[ai6yr]

Currently, in Southern California, there are now 440 repeaters and over 250 clients, all of which can be discovered and seen with great ease. However, there is a maximum of 350 total nodes allowed by devices (firmware? cli?). In the Bluetooth app, there is an "Auto Add Selected" function to restrict what clients to add, instead of automatically adding all nodes; and similarly, an "Overwrite Oldest" which will overwrite the oldest contacts in the contact list when the list is full, EXCEPT favorites. There needs to be some similar functionality in the CLI, otherwise, you quickly max out at 350 contacts and have to somehow force delete contacts and hope the contacts you need flood advertise before it fills up again.

This is implemented in the example companion app at MyMesh.cpp
https://github.com/meshcore-dev/MeshCore/blob/e738a7477737964464038a87b3113a7a0ce7ebbc/examples/companion_radio/MyMesh.cpp#L279

[fdlamotte]

The addition to the protocol has been made recently, implementation in meshcore_py will be here soon