Initial version of the sketch with fade control only.

The knob currently controls the led intensity, whereas the warp drive
animation is hardcoded. Future version will have a configurable control
knob to select between fade and warp speed.
Created a small lib for a dual purpose control knob

This first version uses a potentiometer to track a value. If the value
rises above a certain threshold, the library indicates a mode change. It
keeps information whether the knob is currently used to control mode 1 or
mode 2, making it possible to control two analog values using only one
knob.
At the moment, the library is not time sensitve, which means that in order
to change the mode, one of the values is constantly altered until the
threshold is reached. This is of course undesirable and will be addressed
in a future version.
New project for my Warp Drive bookcase lighting project

This project will feature a LED strip for each shelf, providing dimmable
lighting an a switchable warp drive core effect.