adding a proper floating point operation added something like 6 kb to
the resulting bin size, which is not acceptable, I'm pretty tight with
the graphics library! Also added a separate packet/command for
refreshing the display directly, and stopped redrawing the display for
each led update. This allows for a mixed experience, with smooth leds
with "hiccups" and a slow updating display.
added a super basic packet handling mechanism with a tiny buffer,
allowing for easier expansion later on. Added display code, waiting for
actual display to test, improved the cpu load script
