As requested in meshtastic/web#195meshtastic/web#209, information
about whether nodes were connected by MQTT is highly useful for
users of the web interface.
This patch adds a new column to the Nodes page which lists whether
a connection is direct (0 hops, via lora), or how many hops away
and whether the connection is via MQTT.
fixesmeshtastic/web#195fixesmeshtastic/web#209
