x265

So after some testing, we've decided to do the following:

1080p releases - These will be done with the x265 encoding. Probably better quality with a slight reduction in file size. It just takes a longer time to encode

720p releases - Still h264 encoding, like what we do now

SD releases - We're dropping support of SD. Honestly, not many people download them, so hopefully this decision won't affect too many people