As a user I would like to fade actionbars when in combat, so that I can make the screen less cluttered

Provide option for users to configure a combat fade

Use https://wowpedia.fandom.com/wiki/API_SecureCmdOptionParse

"[mod:alt] ALT is held down; [mod:ctrl] CTRL is held down, but ALT is not; neither ALT nor CTRL is held down".