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/src/webrtc.cpp

@@ -16,10 +16,12 @@
 
 #include "livekit/webrtc.h"
 
+#include "rtc_base/helpers.h"
 #include "rtc_base/logging.h"
 
 namespace livekit {
 RTCRuntime::RTCRuntime() {
+  // rtc::LogMessage::LogToDebug(rtc::LS_INFO);
   RTC_LOG(LS_INFO) << "RTCRuntime()";
   RTC_CHECK(rtc::InitializeSSL()) << "Failed to InitializeSSL()";
 
@@ -57,6 +59,10 @@ rtc::Thread* RTCRuntime::signaling_thread() const {
   return signaling_thread_.get();
 }
 
+rust::String create_random_uuid() {
+  return rtc::CreateRandomUuid();
+}
+
 std::shared_ptr<RTCRuntime> create_rtc_runtime() {
   return std::make_shared<RTCRuntime>();
 }