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/libwebrtc/configure.py

@@ -1,6 +1,9 @@
+# Ignore this file if you have no intention of using a custom libwebrtc build.
+
 import platform
 import subprocess
 
+# Edit the target_os/target_cpu to match your platform.
 GN_ARGS = [
     "is_debug=true",
     "treat_warnings_as_errors=false",
@@ -18,3 +21,6 @@ GN_ARGS = [
 cmd = ["gn", "gen", "out/Dev", "--args=" + ' '.join(GN_ARGS)]
 print("Executing:", cmd)
 subprocess.call(cmd, shell=platform.system() == "Windows")
+
+# Use this command when developing on libwebrtc:  
+# ninja -C out/Dev sdk:default_codec_factory_objc api api/task_queue:default_task_queue_factory api/audio_codecs:builtin_audio_decoder_factory sdk:videocapture_objc pc:peerconnection sdk:native_api callback_logger_objc default