* Add area sampling scaler to allow for super-sampled anti-aliasing.
* Area scaling filter doesn't have a scaling level.
* Add further clarification to the tooltip on how to achieve supersampling.
* ShaderHelper: Merge the two CompileProgram functions.
* Convert tabs to spaces in area scaling shaders
* Fixup Vulkan and OpenGL project files.
* AreaScaling: Replace texture() by texelFetch() and use integer vectors.
No functional difference, but it cleans up the code a bit.
* AreaScaling: Delete unused sharpening level member.
Also rename _scale to _sharpeningLevel for clarity and consistency.
* AreaScaling: Delete unused scaleX/scaleY uniforms.
* AreaScaling: Force the alpha to 1 when storing the pixel.
* AreaScaling: Remove left-over sharpening buffer.
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