Nautilus-trader

Release Notes

The main thrust of this release is to refine some subtleties relating to order
matching and amendment behavior for improved realism. This involved a fairly substantial refactoring
of `SimulatedExchange` to manage its complexity, and support extending the order types.

The `post_only` flag for LIMIT orders now results in the expected behavior regarding
when a marketable limit order will become a liquidity `TAKER` during order placement
and amendment.

Test coverage was moderately increased.

Breaking Changes
None

Enhancements
- Refactored `SimulatedExchange` order matching and amendment logic
- Added `risk` subpackage to group risk components

Fixes
- `StopLimitOrder` triggering behavior
- All flake8 warnings

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Release Notes

The main thrust of this release is to introduce the Interactive Brokers
integration, and begin adding platform capabilities to support this effort.

Breaking Changes
- `from_serializable_string` methods changed to `from_serializable_str`

Enhancements
- Scaffold Interactive Brokers integration in `adapters/ib`
- Added the `Future` instrument type
- Added the `StopLimitOrder` order type
- Added the `Data` and `DataType` types to support custom data handling
- Added the `InstrumentId` identifier types initial implementation to support extending the platforms capabilities

Fixes
- `BracketOrder` correctness
- CCXT precision parsing bug
- Some log formatting

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