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* Implement indicator-based option price model
This model uses IV and Greeks indicators to implement Lean's own option pricing model
* Minor fixes
* Address peer review
* Minor tests fixes
* Make the indicator based price model the default for options
* Address peer review
* Cleanup and minor changes
* Support indicators configuration for new pricing model
* Some cleanup
* Add QL option price model example algorithm
* Return lean models from static helpers
* Minor tests fixes
* Minor test fixes
* Address peer review
* Cleanup
* Fix unit tests
* Move QL models to OptionPriceModels.QuantLib.*
* Add forward tree helper method
Added support for history requirements, exposed by vol models. AM processes requirements.
Added new volatility model - standard deviation of returns - default vol model. Compared its results with publicly available.
Refactored option pricing engine to support optimal approximation calculations.
Added basic greeks approximation in case they are not available in QL. Tests.
Updated BasicTemplateOptionHistoryAlgorithm to print greeks.