Detect "RemoteDebug" targets over MDNS

RemoteDebug targets like chrome, firefox or node procesesses could expose themselves over MDNS, which easily could be discovered by this app.

http://agnat.github.io/node_mdns/user_guide.html#service_types

Start by reviewing the Electron app's existing target-discovery entry points; the issue identifies RemoteDebug targets such as Chrome, Firefox, and Node and links to the node_mdns service-types guide. Define which MDNS services should be discovered and verify that discovered targets appear correctly in the app.

Written by the indexing model from the issue text.