[feature request] resolution limits

[ThomasSteve83]

whether the resolution is set by a scale of the window resolution, or dynamically (looking forward to that),
maybe the user should be able to set hard limits on how high and low the absolute render resolution can go

this could be done in terms of a value range that neither axis of the resolution is allowed to go outside of, or a range for the total pixel count

in either case, the scales that hit those limits are set as hard limits for the resolution scale