Dark Mode alternative icons.

[eil]

Not a killer feature or one that most users can't live without, but it would add user-experience comfort = an ability to state 2 icons for user buttons.
Smtl like: path\icon1.ico||path\icon2.png = second used only when Dark Mode.
The idea came after creating several buttons in a row and noticing 2 important things:
1. It's quite hard to pick an icon that looks same good in both modes!('cause their requirements for visual not only opposite, but basically contradicting)
2. Lots of sites with some icons/clip-art provide few variants, often with outlines and "plain colour" = these exactly respond to needs of 2 modes, yet both look so-so for opposite mode.

User buttons are main target, but Catalog and CFI could benefit that too. For pity scripted menus can't dark mode, so they are out of scope.