* Holding light button on a non-element screen will turn on the light.
* The alarm and led button press moves back to the currently-selected element symbol page rather than the next and previous one
* Usage update
* Added subscreens to periodic table face; added title and faster scrolling
* Resized buf for element display
* Fixed scrolling to work on actual hardware
* Added delay before _loop_text at title and bugfix on elements shorter than 6 char
* Title screen displays when le_mode starts
* Added documentation on usage and removed unneeded variable
* Check that color is valid
Instead of merely checking that COLOR is set, check that it is one of
RED, BLUE or GREEN
* Added ability to turn off sound and timer with modes
* Added enum for mode
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Co-authored-by: Wesley Ellis <tahnok@gmail.com>