Fixes for config changes, WebSockets presets update

Updated AppRTCHelper to support new format for WebRTC message
(variable names changed).
Removed MemorizingTrustManager option from preferences since it is
currently unused in the socket connection code.
Changed default port for connection to 3000 to match SVMP Overseer
default port.
Merge pull request #3 from jportner/websocket-wip

Fixes for config changes, WebSockets presets update