Add to this any type of conversion or relations between units. PIXELS_PER_INCH or BITS_PER_LITER rather than SCREEN_SCALE_FACTOR and VOLUME_RESOLUTION, avoi

Add to this any type of conversion or relations between units. PIXELS_PER_INCH or BITS_PER_LITER rather than SCREEN_SCALE_FACTOR and VOLUME_RESOLUTION, avoids all kinds of mistakes like inverting ratios etc.