IB-Tracker v2.5.0

Add: When no Trades exist, display an informative message in the Active Trades list.
Change: Refactor Reconcile_position().
Change: Investigate why portfolio only updates in 3 minute intervals and not on every value change (like api says).
Change: Refactor by adding Trade::CalculateAdjustedCostBase().
Change: Refactor UpdatePortfolio and RequestPositions.