Misc bugfix

* Add proper support for server certificates (only for local WV devices)

* Fix issues with some services that append extra data, which is not a PR WRM initData, to the WV PSSH

* Fix audio/video codec support detection to check for real browser s…

…upport for them

* Fix logic error when comparing the key system name
* Fix for services that checks all of the availalbe kids in keyStatus
  * Also work around for some services that expect flipped bytes
* Handle cases where a website sends a mixture of WV and PR PSSH
* Add handler for MediaKeySession.close

Remove an unnecessary log

Revert "Update README.md"

This reverts commit 63aaf2c.