Verso DemoKit — default demo

A full-screen crossfade of three verso.shadertoy fragment shaders (plasma,
tunnel and kaleidoscope) with a title on top. This is the demo the app loads by
default; edit data/demokit.json to make it your own.

Run:  ./VersoDemo   (or: ./VersoDemo --input data/demokit.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.
