Adds support for fee, fill and slippage custom modelling.
Adds CustomModelsAlgorithm to showcase the new feature
Modifies C# version of CustomModelsAlgorithm to match existing data in github
Due to pythonnet limitations, the list of SubmitOrderRequest could not be modified by OnMarginCall event handler. We now get a new list from that method and update the list in the wrapper.
Adds Algorithm.PythonTools project that enables PTVS (Python Tools Visual Studio, https://microsoft.github.io/PTVS/). With PTVS, the user has more tools to work with python script (e.g.: code completion).