Polkadot CC1 v0.8.13

Upgrade priority: Medium (timely upgrade recommended) - due to change(s): Fix tx-pool returning the same transaction multiple times (paritytech/substrate#6535)

Native runtimes:

• Polkadot: 13
• Kusama: 2013
• Westend: 33

This release was built with the following versions of rustc. Other versions may work.

• rustc 1.44.1 (c7087fe00 2020-06-17)
• rustc 1.46.0-nightly (67100f61e 2020-06-24)

Client

• Support synching of blocks that are not new_best (paritytech/substrate#6508)
• Remove the service, replacing it with a struct of individual chain components (paritytech/substrate#6352)
• Medium Fix tx-pool returning the same transaction multiple times (paritytech/substrate#6535)

Runtime

• Downward & upward messages (#1266)
• Add registrar proxy (#1296)
• Allow voting in democracy (#1331)
• Refactor as_sub to make things clearer (paritytech/substrate#6503)
• Staking payout creates controller (paritytech/substrate#6496)