Example — Timeline, keyframes & groups

A short timeline showing groups, keyframes and an image: an intro group (a logo
verso.imageviewer plus an animated title/subtitle) followed by a staggered
verso.group of credits that slide and fade in.

Run:  ./VersoDemo --input data/example-scene.json

CODE:  VersoDemo examples
MUSIC: test.mp3 (placeholder)

If you're using Windows and missing DLLs then install the x64 version of
Microsoft Visual C++ Redistributable for Visual Studio 2019.
