A new "Algorithm Settings" action has been added to the Advanced button of the processing algorithms interface. Selecting it shows a panel which allows users to control general processing settings which apply to a particular instance of the algorithm execution. It's intended to be a place where a user can override their global processing settings on an ad-hoc basis without having to change their usual default settings.
Includes settings for:

• invalid geometry handling (Unlike the existing per-parameter setting override for this, setting the handling method here will apply to ALL inputs for the algorithm)
• distance unit and area units to use for distance/area measurements