Use Lyrebird to provide WebTunnel PT Client

A few weeks ago, the anti-censorship team have been made aware of an ongoing effort to reduce android apk size of distributed binaries. We purposed integrating WebTunnel client into Lyrebird.

This change has been completed, and once Tor browser bundle include this change, WebTunnel Client will no longer require shipping a separate binary and could thus have a reduced binary size.