Order Manager

[asmodehn]

We need some basic feature in the lib to estimate the "sanity" of the user's orders (closed and opened).
The aim is to have an easy set of metrics to validate/invalidate a strategy.

Design Idea:

• The aiokraken.Orders class allows access to all the orders of the current user. Only long term "Invest" kind of order are allowed via the class (no tracking)
• Each instance of that class allows to pass an order (and receive callback when filled), while tracking them (using some instance uuid).
• Each instance provide analysis features of this list of orders : historical P&L for closed orders, expected returns of open orders, etc.
• The aiokraken.Orders class provide an overall P&L analysis.

For inspiration, refer to https://github.com/ranaroussi/quantstats https://github.com/quantopian/pyfolio