[feature] Filter by Online Beacons

[d3adzo]

Is your feature request related to a problem? Please describe.
In the "Hosts" tab, it can be difficult to tell which systems we have active beacons on.

Describe the solution you'd like
Having the ability to filter out targets with "0/X" online beacons with a slider, similar to that of the Quest tab's "one beacon per host".

Describe alternatives you've considered
Add a new filter key to the current search bar to include something like "online" or "alive".