[Feature Request]: Allow node groups for UI filtering and bulk updates

[bluesk1d]

Is your feature request related to a problem? Please describe.

Currently, all known nodes are displayed in the node list/map. This can become cluttered and difficult to navigate depending on how many nodes are nearby.

Describe the solution you'd like

The ability to create a group(s) for nodes that you care about/manage would allow for UI filtering to only display those. Potentially, this could also display 3rd party hops in a different color. This could also pave the way for bulk updates.