Implement Area sampling for scaling the internal resolution#197
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Allows non-Bilinear resampling to work regardless of RmlUi being init
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Adds Area as a resampling method which, when compared to the current Bilinear method, simultaneously produces a cleaner, softer image when downscaling the internal resolution, and a significantly sharper image when upscaling. It's even a pretty decent substitute for anti-aliasing, but we can still do better on that front.
Dolphin's GLSL implementation was my sole reference for the technique while learning how to do it in WGSL. The Area sampling method itself is said to be public domain, so I believed that to be okay and just a matter of convenience. If it actually does present a licensing problem, please close this PR.