v12.0.0

The final release of v12, identical to RC3.

This is the first release candidate for the upcoming v12 actors series, that will power Filecoin nv21.

• FIPs included

• FIP0052: Increase Max Sector Commitment to 3.5 years

• FIP0059: Synthetic PoRep

• FIP0073: Remove beneficiary from the self_destruct syscall

• FIP0075: Improvements to FVM randomness syscalls

Protocol Improvements and Bugfixes

• Storage miner actor: Fix sector activation epochs overwritten by replica update (#1229)
• Storage miner actor: Batch calls to ClaimAllocations during ProveCommitAggregate (#1304)
• Verified registry actor: Process allocation claims in batches by sector (#1337)
• Storage miner/market actors: Batch calls to ActivateDeals by sector during ProveCommitAggregate (#1310)
• Storage market actor: Deprecate usused ComputeDataCommitment method (#1354)
• Storage market actor: Add CommD as option in return value from BatchActivateDeals (#1361)
• Storage miner actor: Replace the per-sector "simple QA power" value with a bitfield of flags (#1395)
• Storage miner actor: Removed support for v1 proof types (#1391)