feat(): make it possible to use bore as a module

[MrCyjaneK]

This pull request change Bore's client to store Bore's HTTP/HTTPS/TCP links, so it is possible to use it as a module, without the need for capturing stdout.

Values can be obtained by client.RemoteData which is:

type Data struct {
	HTTPurl   string `json:"httpurl"`
	HTTPSurl  string `json:"httpsurl"`
	DirectTCP string `json:"directtcp"`
}

This change should be backwards compatible (old clients will get json in response, old servers will send same response as previously, and it will be forwarder to user, but programs that use it as module will not work)

I need this for borachi.

Old server - new client

Old client - new server

New client - new server

Borachi - using as a module

[MrCyjaneK]

Together with that, I've also added on option to mark protocols as unsupported.
For example when you are running behind cloudflare direct TCP will not work, and when you do not have a reverse proxy HTTPs will not work.

protocols:
  http: false
  https: false
  tcp: true

[MrCyjaneK]

if somebody needs this:

replace github.com/jkuri/bore => github.com/mrcyjanek/bore v0.4.1-0.20210806143115-0282435d73d8

[MrCyjaneK]

I see that @jkuri is back, let me bump this as I'm still using forked version of this project.