Adding a "reload" function

[PatriceVignola]

I have a use case where I need to change the subtitle at runtime. The chromecast SDK has a "reload" function that you can call after making changes to audio or subtitles tracks and it will restart the player by keeping the timestamp. Unfortunately, chromecasts doesn't expose this function so we have to do workarounds like saving the timestamp, stopping the player and starting it again. The experience obviously doesn't feel as seamless and the whole process takes more time to complete.

Would adding a reload function to chromecasts be a good idea? I would gladly make a PR, but I wasn't sure if that's something that you guys want or if people are still working on this project (the last commit was made 6 months ago).