Automatic snapshot pre-release monthly-2021-12

Changes since last snapshot (monthly-2021-11)

Substrate changes

Runtime

• Fix order of hook execution (#10043)
• Support MMR Pruning (#9700)
• Fix Weight Handlebar Template (#10302)
• Offence implementations can disable offenders independently from slashing (#10201)
• rework staking::reap_stash (#10178)
• Kill the light client, CHTs and change tries. (#10080)
• implement dispatch_as (#9934)

Client

• Add group name in task metrics (#10196)
• Add a trie_root_hash variant for chain specs genesis (#10140)

API

• Fix order of hook execution (#10043)
• Stabilize "seal1" seal_call (#10366)
• Moving pallet-asset-tx-payment from cumulus to substrate (#10127)
• Make authorship soft deadline configurable. (#10125)
• pallet-session: Migrate the historical part to the new pallet macro (#9878)
• Kill the light client, CHTs and change tries. (#10080)
• frame_support::pallet_prelude: Add scale_info::TypeInfo (#10221)
• Better error for when origin filter prevent the call to be dispatched (#10134)