Add more method for Local/Remote Track. (livekit#46)

* Add more method for Local/Remote Track.

* update.

* update.

* Upgrade ffi protocol.

* fix: Flip the local texture2D for OSX.

* update.

* Add IRtcSource interface to LocalTrack to support synchronous mute calls.

* update.

* bump version for ffi.

* update ffi protocol.

* fix.

update client-sdk-rust~