Rename HQx2 and HQx4 filters

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The filters currently named HQx4 and HQx2 are easily confused with the original 
HQx filters developed by Maxim Stepin. You can also see in the comment headers 
that they're actually named very differently.

The filters currently named HQx4 and HQx2 were originally developed for 
Playstation emulators and only do upscaling without any of the complex rule 
sets used in the original HQx filters.

Originally these filters were developed as a higher quality version of the 
2xScale and 4xScale shaders, so I suggest renaming them to 2xScaleHQ and 
4xScaleHQ to make the situation less confusing.

The shaders were originally part of this package: 
https://www.dropbox.com/s/o2r0z95fhhea52c/epsxe_Shaders.7z

Original issue reported on code.google.com by Jules.B...@gmail.com on 25 May 2014 at 1:07

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Or just 2xScale and 4xScale, then we can be absolutely sure no one confuses 
them with the HQx2 and HQx4

Original comment by Jules.B...@gmail.com on 25 May 2014 at 1:10

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I've also discussed the issue with libretro and they've opted to rename the 
shaders: 
https://github.com/libretro/common-shaders/commit/d772cbd697290bb4c4f89caa678be6
385003358a

Original comment by Jules.B...@gmail.com on 25 May 2014 at 1:24

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Small correction, they're currently called HQ2x and HQ4x. Still a very 
confusing situation.

Original comment by Jules.B...@gmail.com on 25 May 2014 at 2:54

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