Plain hypertext parser by Vitaly Sinilin

Allows reading of plain hypertext (htx) documents. Plain hypertext (htx) document format is a simple human-readable hypertext. It is under development. The current spec (in Russian) is located at <a rel="nofollow" href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/943fd8e273990b8e2963e28525139532580c9666358f338722f2a623205a5cf5/http%3A//kp4.ru/htx/htx-0.1.htx">http://kp4.ru/htx/htx-0.1.htx</a>.