feat: video publishing (#42)

- Prepare webrtc abstraction ( for future wasm support )
- Added track publish support for videos
  - Added LogoTrack example to simple_room demo
- Lot of cleanup
- There are compiler warnings I'll solve on our v1 release

webrtc-sys/include/livekit/video_frame.h

@@ -57,7 +57,7 @@ class VideoFrameBuilder {
   VideoFrameBuilder() = default;
 
   // TODO(theomonnom): other setters?
-  void set_video_frame_buffer(std::unique_ptr<VideoFrameBuffer> buffer);
+  void set_video_frame_buffer(const VideoFrameBuffer& buffer);
   void set_timestamp_us(int64_t timestamp_us);
   void set_rotation(VideoRotation rotation);
   void set_id(uint16_t id);
@@ -67,6 +67,6 @@ class VideoFrameBuilder {
   webrtc::VideoFrame::Builder builder_;
 };
 
-std::unique_ptr<VideoFrameBuilder> create_video_frame_builder();
+std::unique_ptr<VideoFrameBuilder> new_video_frame_builder();
 
 }  // namespace livekit