Front-end for aspect software

Here's what I put together last week for the front-end (e.g., communication) for the aspect software, largely created by gutting the HEROES/SAS flight software (so there is some detritus).  It is not yet integrated yet in any way with the camera-handling code or processing code.

To use this front-end, you'll need to set up the submodule (see `README.md`) and then build the program using:

    make main

Please review this, otherwise I will merge it myself in a few days.