Better Way of Generating Trial Structures

[jmdelahanty]

I'll probably never get to do this, but here's a better way (I think) of generating trial structures that's mostly inspired by AutoPilot.

Instead of making one big array and subsection-ing them into different pieces, it'd be a lot better to have "stages" of trials that are built and defined in a configuration file. This is what autopilot does and it's just better/easier to understand code wise, and a lot more modular.

The best way is to probably do away with generating big arrays at all and just generating them one by one. But I'm still not good enough at multithreading/processing to send over serial communications that are timed appropriately. Something to think about...