Implement audio call application

[jdknives]

Feature description

@0pcom brought up, that it may be useful for testing, to implement some real-time communication application such as a voice chat. We need to investigate if there is a library out there that lets us implement a very basic call application over Skywire.

[NESS-Network]

enumer.org and built-in in NESS a Fiber coin signalwire.com and AntiSIP have great documentations

[NESS-Network]

[NESS-Network]

PBX services can be monetized, paid in coin hours for example

[0pcom]

A working example / alternative which uses dmsgweb for streaming media which can be configured to use skywire routes

https://github.com/skycoin/skywire/wiki/dmsghttp+dmsgweb-streaming-media

It does not comprise a visor application at this time, however dmsgweb IS now included with the unified binary release.

closing this for now, on that note