3e52816f6e
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`CashBuyingPowerModel`, which reflected on `AlphaStreamBrokerageModel`, a margin-only brokerage. It also didn't consider the account type, so `InteractiveBrokersBrokerageModel` was using the margin model even if `AccountType.Cash` was selected. Removes `GetBuyingPowerModel` method from other Brokerage Models when their cases are covered by `DefaultBrokerageModel` Fixes some typoes in `TradierBrokerageModel` Fixes unit and regression tests. For the regression tests, we have explicitly set the brokerage model.