Update VP8 according to RFC 7741

[lem21h]

Changes for bit:
L: TL0PICIDX present. When set to 1, the TL0PICIDX MUST be present
and specified as below, and the T bit MUST be set to 1.
Otherwise, TL0PICIDX MUST NOT be present.

Add Y bit and KEYIDX value to be obtain

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[bgrozev]

Thanks for the contribution!

Are you actively using this code? We've now moved to jitsi#jitsi-media-transform, where it's been slightly modified already: https://github.com/jitsi/jitsi-media-transform/blob/master/src/main/java/org/jitsi_modified/impl/neomedia/codec/video/vp8/DePacketizer.java

If you use the de-packetizer alone, I would suggest to migrate to jitsi-media-transform (which apart from including kotlin should be a much lighter dependency), because it is where our efforts are currently concentrated.

[lem21h]

Hi, @bgrozev thank you for the update. I've been using libjitsi for a while.
I had a look into that jitsi-media-transform and the changes that I've made here are also missing there.
If you don't mind, I will make PR there as well :)