Close client connection when it becomes idle

[glbrntt]

At the moment the client will persist a connection to the server even if there is no active RPCs. Ideally the client should disconnect when the connection becomes idle after 5 minutes of inactivity, for example. On starting an RPC the client should re-establish a connection to the server.

[MrMage]

We could also consider adding on option for this to the server, to have it enforce conserving of server-side resources.

[audio-algorithms]

managing a connection is the responsibility of the application. The client should not auto disconnect unless the application instructs it to do so.