[Feature/Bug] 2880x2160 Mode Wrongly Scales 320px and 640px Content, and Add User-Modifiable Horizontal Integer Option for Line Multiplier Mode

In line multiplier mode, the horizontal resolution can be wrongly scaled at times, especially in 2880x2160 mode. So, it would be great to be able to set a specific multiplier for horizontal scaling, for amamorphic widescreen content and consoles that use different aspect ratios, which I imagine would range from 1x up to 9x if the option is impelmented.