Automatic snapshot pre-release monthly-2021-05

Changes since last snapshot (monthly-2021-04)

Substrate changes

Runtime

• Ensure inherent are first (#8173)
• Add PoV Tracking to Benchmarking Pipeline (#8559)
• Support code blobs compressed with zstd (#8549)

Client

• subkey: display SS58 encoding of public key (#8674)
• Authority-discovery no longer publishes non-global IP addresses (#8643)
• Enable --no-private-ipv4 by default for live chains (#8642)
• Make non-validators listen on /ws by default (#8609)
• contracts: Add RPC that allows instantiating of a contract (#8451)
• Add PoV Tracking to Benchmarking Pipeline (#8559)
• Support code blobs compressed with zstd (#8549)

API

• migrate pallet-elections-phragmen to attribute macros (#8044)
• Make pallet macro generate accessor to PalletInfo information on pallet placeholder (#8630)
• expose set_timestamp for runtime benchmarks (#8601)
• Ensure inherent are first (#8173)