Release v0.27.0

*2020-10-30*

This release contains a fix (read: large reduction in memory use) around auction modes with particularly large order books that caused slow block times when handling orders placed during an opening auction. It also contains a lot of internal work related to the liquidity provision mechanics.

New:
- [#2498](https://github.com/vegaprotocol/vega/pull/2498) Automatically create a bond account for liquidity providers
- [#2596](https://github.com/vegaprotocol/vega/pull/2496) Create liquidity measurement API
- [#2490](https://github.com/vegaprotocol/vega/pull/2490) GraphQL: Add Withdrawal and Deposit events to event bus
- [#2476](https://github.com/vegaprotocol/vega/pull/2476) 🔥`MarketData` now uses RFC339 formatted times, not seconds
- [#2473](https://github.com/vegaprotocol/vega/pull/2473) Add network parameters related to target stake calculation
- [#2506](https://github.com/vegaprotocol/vega/pull/2506) Network parameters can now contain JSON configuration

Improvements:
- [#2521](https://github.com/vegaprotocol/vega/pull/2521) Optimise memory usage when building cumulative price levels
- [#2520](https://github.com/vegaprotocol/vega/pull/2520) Fix indicative price calculation
- [#2517](https://github.com/vegaprotocol/vega/pull/2517) Improve command line for rate limiting in faucet & wallet
- [#2510](https://github.com/vegaprotocol/vega/pull/2510) Remove reference to external risk model
- [#2509](https://github.com/vegaprotocol/vega/pull/2509) Fix panic when loading an invalid genesis configuration
- [#2502](https://github.com/vegaprotocol/vega/pull/2502) Fix pointer when using amend in place
- [#2487](https://github.com/vegaprotocol/vega/pull/2487) Remove context from struct that didn't need it
- [#2485](https://github.com/vegaprotocol/vega/pull/2485) Refactor event bus event transmission
- [#2481](https://github.com/vegaprotocol/vega/pull/2481) Add `LiquidityProvisionSubmission` transaction
- [#2480](https://github.com/vegaprotocol/vega/pull/2480) Remove unused code
- [#2479](https://github.com/vegaprotocol/vega/pull/2479) Improve validation of external resources
- [#1936](https://github.com/vegaprotocol/vega/pull/1936) Upgrade to Tendermint 0.33.8