v3.0.0-rc1

jianj@google.com

f034976b · Bump up codec ABI version for control IDs re-arrangement · Mar 11, 2021

Release Candidate 1 for v3.0.0 Braeburn

libaom v2.1.0 is now v3.0.0 with following changes:

Several critical fixes were cherry picked.
Control IDs were re-arranged.
Codec ABI version was bumped up.