Refactor component functionality to separate modules

[calebbraun]

As we add more classes to components.py, the file may get too long.

It would be better to refactor the classes (or at least the long ones) so that the main functionality is implemented in a separate python module for each component, with the class derived from ComponentBase providing a thin wrapper that grabs inputs needed from other components and passes them to a main function in the relevant python component.

[rplzzz]

We definitely need this.