make methods on_ws_... protected on wamp_websocketpp_websocket_transport about autobahn-cpp

[pratman]

Should I split this issue?
As the throw is self-produced and seems to be a bug.
The request to make those methods protected instead of private is an enhancement to make the transport more versatile.

[oberstet]

the issue should describe the problem - not a proposed solution. and yes, if there are 2 problems, then there should be 2 issues. after that, we can discuss possible solutions. then we can select - if that involves changing public API, other users should have a change to state an opinion. then a PR is needed.

rgd inheritance: unlikely we support that. implementation inheritance for users is wrong most of the time. but that doesn't matter: what is the problem in the first place? then we can discuss possible solutions.

[pratman]

Creating 2 issues for 2 different topics