Add option to hide bar when full or empty
This is a great tool for displaying resources in a easy to parse way. I'd love if bars could optionally be hidden when empty/full. Hitpoints for example I don't need to see when full. Similarly, wound levels in SWADE don't need to be displayed when they are at 0.
I poked at adding a simple override in api.js:isBarVisible if (bar.value == 0) visibility = BAR_VISIBILITY.NONE
but it's pretty clumsy and gets overridden often.