v4.0.0 RC1

[ShankarWarang]

Edgeware node v4.0.0 based on Polkadot v0.9.19

Changelog:

• Migrated the codebase to substrate v4 (polkadot-v0.9.19 branch).
• Fixed the vote conviction delay by reverting from one day to one week.
• Updated EdgeEVM and fixed known issues (gas metering can be optimised in the later stages).
• Added a storage migration to refund the web3 foundation wallet.

(If your existing chainspec has a mention of "lightSyncState", please remove that line.)

---

This discussion was created from the release v4.0.0 RC1.