Custom Multiline Stencil - Parametric

Remix of https://www.thingiverse.com/thing:1663405 with added features:

* custom font size
* unlimited number of text lines
* custom thickness
* two different stencil forms
* slanted text in z-direction (does not work in thingiverse customizer and renders really slow!)

Needs the following font installed, if you run OpenSCAD locally: https://fonts.google.com/specimen/Allerta+Stencil