Add embedded openssl library for https and wss,
and move EREndian.h into project directory because
it's essential and not distributed separately.

Embedded external libraries is only for Windows, and it contains
libraries building on Windows is hard. If someone want to use
own built library, it's OK to overwrite. Other OS's must use their
built libraries from package management system (yeah, it's so easy).
Add empty User class.
Implement SSL/TLS Support on IrcClient.