[Feature] Simulation/Testing Mode

[louisgv]

Feature request

1. Simulation mode vs. trading mode. I want a single flag that I can set where the system just logs data for the trader to review and decide how to tune their bot. In this mode I want data fed into the profit module but no trades to ever occur. Ideally there is an additoional flag to indicate using the real exhchange APIs versus the test APIs that some exchanges provide.