MFH: r530254 r530533 r530935 r531164 r531466 r531807 r531987 r532242 r532607 r533219 r533596 r534218 r534700 r535836

multimedia/aom: update to 2.0.0

This release was carefully tested upstream and should better match
users/consumers expectation than a random snapshot 1 month before.

Changes: https://aomedia.googlesource.com/aom/+log/0bb420dd0..v2.0.0
Approved by: ports-secteam (riggs)