Implement PortfolioBias for MVOPCM, BLOPCM, AIPCM

- Implement portfolio bias for
`MeanVarianceOptimizationPortfolioConstructionModel`,
`BlackLittermanOptimizationPortfolioConstructionModel`,
`AccumulativeInsightPortfolioConstructionModel`. Adding unit tests

Algorithm.Python/MeanVarianceOptimizationFrameworkAlgorithm.py

@@ -65,8 +65,4 @@ class MeanVarianceOptimizationFrameworkAlgorithm(QCAlgorithm):
         # Drops SPY after the 8th
         last = 3 if self.Time.day > 8 else len(self.symbols)
 
-        return self.symbols[0:last]
-
-    def OnOrderEvent(self, orderEvent):
-        if orderEvent.Status == OrderStatus.Filled:
-            self.Debug(orderEvent)
+        return self.symbols[0:last]