Polling Transport

[lachlan2k]

It would be great if RSSH could support polling over HTTP(S) as a transport, à la ferryman.

Very useful for when you only have HTTP/HTTPS as your egress, and websockets don't work.

[NHAS]

The first version of this now exists on unstable.

Its still quite broken, clients that disconnect arent removed from the connection list, its a bit inefficient, etc. But its there.

Im going to do some cleanup.

Todo:

• Disconnect clients correctly
• Limit connections to only public keys we know (using public keys are a password)
• Limit max number of connections per public key
• Customize comms path

[NHAS]

This is now ready enough to be on unstable for testing