Box with sliding top

Remix of https://www.thingiverse.com/thing:1201466 with the following modifications:
(1) Flipped the lid right-side up, to simplify subsequent customization
with labels, decorations, etc.
(2) Resized the lid so it does not protrude from the end of the box when closed
(3) Removed Y divider code which original author notes as disabled
(4) Renamed lidSnugness to lidPlay. Increasing this value increases the degree
of play or looseness of the lid. This makes more sense than "snugness", which
would imply that an increased value would increase how snug or tight the lid
fits.