Angled base for NTP clock

The original remix of the [NTP-based projection clock by crisspen](https://www.thingiverse.com/thing:4688050) was for a perfectly flat ceiling. This re-remix is for a base angled at 16.5 degrees, which happens to be the angle of my ceiling. Most of the design elements are taken from the original, but this version is not meant to be adjustable.