Release v0.38.0

*2021-06-11*

Improvements:
- [#3546](https://github.com/vegaprotocol/vega/pull/3546) - Add Auction Extension trigger field to market data
- [#3538](https://github.com/vegaprotocol/vega/pull/3538) - Testing: Add block time handling & block time variance
- [#3596](https://github.com/vegaprotocol/vega/pull/3596) - Enable replay protection
- [#3497](https://github.com/vegaprotocol/vega/pull/3497) - Implement new transaction format
- [#3461](https://github.com/vegaprotocol/vega/pull/3461) - Implement new commands validation

Fixes:
- [#3528](https://github.com/vegaprotocol/vega/pull/3528) - Stop liquidity auctions from extending infinitely
- [#3567](https://github.com/vegaprotocol/vega/pull/3567) - Fix handling of Liquidity Commitments at price bounds
- [#3568](https://github.com/vegaprotocol/vega/pull/3568) - Fix potential nil pointer when fetching proposals
- [#3554](https://github.com/vegaprotocol/vega/pull/3554) - Fix package import for domain types
- [#3549](https://github.com/vegaprotocol/vega/pull/3549) - Remove Oracle prefix from files in the Oracle package
- [#3541](https://github.com/vegaprotocol/vega/pull/3541) - Ensure all votes have weight initialised to 0
- [#3539](https://github.com/vegaprotocol/vega/pull/3541) - Address flaky tests
- [#3540](https://github.com/vegaprotocol/vega/pull/3540) - Rename auction state methods
- [#3533](https://github.com/vegaprotocol/vega/pull/3533) - Refactor auction end logic to its own file
- [#3532](https://github.com/vegaprotocol/vega/pull/3532) - Fix Average Entry valuation during opening auctions
- [#3523](https://github.com/vegaprotocol/vega/pull/3523) - Improve nil pointer checks on proposal submissions
- [#3591](https://github.com/vegaprotocol/vega/pull/3591) - Avoid slice out of access bond in trades store~