Make trail icon, length and colour gradient configurable

[jendrummo]

I want to use it as a magic effect that follows my cursor, but it's too long and distracting at the moment.

[upgradeQ]

@jendrummo try changing this variable

cursor-heatmap-trail/app/js/main.js

Line 17 in eb8968e

dots.length > 50 && dots.pop();

I don't know if you could though, it seems that it packs as one executable. You can use the same code from this app with little modifications to run inside OBS Studio browser source, as a local file. I have cursor trails which use web technologies to render on transparent background. See - OBS-Studio-Cursor-skin , the web version requires Python to get mouse position from OS, there is also a shader based mouse trail which you try without installing anything assuming you are on Windows.