Implement support for in-browser playback of screen recordings

Screen recordings of Guacamole sessions are simply dumps of the Guacamole protocol data from one side of the connection. Currently, these recordings are played back after being converted to video using guacenc, but they could just as easily be played back directly by Guacamole itself. Direct playback would remove the need to translate recordings to video (an expensive operation) and would allow playback within any browser which Guacamole already supports.

Since the Guacamole.Client object accepts any implementation of the Guacamole.Tunnel interface, implementing some sort of "playback tunnel" which would parse Guacamole protocol from a static file (rather than connect through a Guacamole server tunnel) might be easy.