More caption fonts

Poppins, Montserrat, Inter, Roboto and Bebas Neue join Arial Black and Impact in the caption picker.

Forty seven fonts are installed on the render machine. That number is checked against the picker, because a picker offering a font the renderer does not have will silently substitute another one, and you will only find out when you watch the export.

A check in the build fails when the two lists disagree. Ours did disagree, which is why the check exists.