Release Arbitrum v0.6.0 · OffchainLabs/arbitrum-classic

This release of Arbitrum includes a number of feature additions, code cleanups/refactors, and bug fixes

Features

Add a database of confirmed nodes to the validator to support historical queries (https://github.com/OffchainLabs/arbitrum/pull/342)
Make transaction receipt server handle reorgs and restarts (https://github.com/OffchainLabs/arbitrum/pull/347)
Tag all Arbitrum values with a size (Will be used for measuring storage usage) (https://github.com/OffchainLabs/arbitrum/pull/275)
Add GlobalInbox support for transferring control of funds pending withdrawal (https://github.com/OffchainLabs/arbitrum/pull/325)
Change default behavior of block.timestamp and block.number use based on the L1 block that the transaction was included in rather than the lower bound of the assertion processing the transactions (https://github.com/OffchainLabs/arbitrum/pull/354)
Add ability for validator to serve receipts and answer calls based on the pending state (based on messages in the inbox that haven't been included in an assertion). Add a flag in arb-provider-ethers to accept pending results as confirmed if the rollup chain has deterministic assertions (https://github.com/OffchainLabs/arbitrum/pull/353)

Refactors

Standardize method for marking delivered messages with metadata (https://github.com/OffchainLabs/arbitrum/pull/346)
Measure integration tests and unit tests in separate coverage categories (https://github.com/OffchainLabs/arbitrum/pull/337)
Simplify node graph checkpointing (https://github.com/OffchainLabs/arbitrum/pull/333)

Fixes

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