* Creates IShortableProvider interface + interface impls
* This is the foundational work for the addition of the shortable stocks
feature for backtesting and live trading. Note that the QCAlgorithm
API and the backend transaction handling will be implemented
separately.
* temp; work on preorder checks
* improve checks
* tmep
* Enforces ETB checks at BrokerageTransactionHandler
* Adds ETB Shortable Provider to QCAlgorithm and IAlgorithm
* Removes ETB check from PreOrderChecksImpl
* Removes outdated test, new test to come soon for relevant class
* Work in progress commit, pushing for review.
* Adds new regression algorithm (WIP)
* Enhances ShortableProviderOrdersRejectedRegressionAlgorithm
* Adds new methods to QCAlgorithm
* Move IShortableProvider to have BrokerageModel own it
* Comments updates
* Adds new properties to Equity Security for shortable
* Fixes bug where retrieving open order quantities would aggregate the
submitted order quantity rather than the remaining order quantity for
open orders.
* Fixes bug where quantity of zero would result in a
false positive in QCAlgorithm.Shortable(...)
* Code refactoring and comments updates
Co-authored-by: Jared <jaredbroad@gmail.com>
Gerardo Salazar
3e7af17e02