Enable trading using trader actor

I've created a new trader actor that hooks up the advice with the portfolioManager. There's definitely some ironing out to be done, especially around configuration (it's using config.normal for now, please advice). I'm also thinking it would be nice to actually find out how much of the asset was bought/sold and at which price - for reference, but don't know how to best tie that in.

There's some minor tweaks in the cex.io exchange and portfolioManager, had a few hickups where the trader would halt.

Please advice on the direction of this if it aligns with what you had in mind for the localDB implementation of the trading.