Add mixed-res preset hooks

- These prepend and append preset hooks can be used with almost any crt shaders. Instructions on how to use in readme.md.
- Enable downsampling with almost any shader.

downsample/mixed-res/hooks/README.md

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+# Mixed-Res hooks
+
+These two presets allow almost any crt shader to be used with a game emulated at 4x  internal resolution.
+
+How to use:
+
+1. Load a crt preset;
+2. Disable any curvature feature;
+3. Prepend "mixed-res-4x-prepend.slangp" preset;
+4. Append "mixed-res-4x-append.slangp" preset;
+5. Change any param you desire and save your preset for future usage.
+
+Obs: curvature or any other warp features won't work with this method.

downsample/mixed-res/hooks/mixed-res-4x-append.slangp

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+shaders = "1"
+
+shader0 =  "../../shaders/mixed-res/output.slang"
+filter_linear0 =  false
+wrap_mode0 =  "clamp_to_border"
+scale_type0 =  "source"
+scale0 =  "1.000000"
+
+B_HL = "0.0" 

downsample/mixed-res/hooks/mixed-res-4x-prepend.slangp

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+shaders = "7"
+feedback_pass = "0"
+
+shader0 = "../../shaders/mixed-res/multiLUT-modified.slang"
+scale_type0 = "source"
+scale0 = "1.000000"
+
+
+SamplerLUT1 = "../../../reshade/shaders/LUT/grade-composite.png"
+SamplerLUT1_linear = true
+SamplerLUT2 = "../../../reshade/shaders/LUT/grade-rgb.png"
+SamplerLUT2_linear = true
+
+shader1 = "../../shaders/mixed-res/coder.slang"
+scale_type1 = "source"
+scale1 = "1.000000"
+
+shader2 = "../../shaders/mixed-res/hires-tagger.slang"
+filter_linear2 = "true"
+alias2 = "HiresSource"
+scale_type2 = "source"
+scale2 = "1.000000"
+
+shader3 = "../../shaders/mixed-res/blur-gauss-h.slang"
+filter_linear3 = true
+scale_type3 = source
+scale3 = 0.25
+
+shader4 = "../../shaders/mixed-res/blur-gauss-v.slang"
+filter_linear4 = true
+alias4 = "BlurSource"
+scale_type4 = source
+scale4 = 1.0 
+
+shader5 = "../../../denoisers/shaders/bilateral-horizontal.slang"
+filter_linear5 = false
+wrap_mode5 = "clamp_to_border"
+scale_type5 = source
+scale5 = 1.0
+
+shader6 = "../../../denoisers/shaders/bilateral-vertical.slang"
+filter_linear6 = false
+wrap_mode6 = "clamp_to_border"
+scale_type6 = source
+scale6 = 1.0
+
+
+LUT_selector_param = "2.000000"
+
+IR_SCALE = "4.0"
+B_TRESH = "0.30"
+B_HL = "0.0"
+FRANGE = "2.000000"
+FBSMOOTH = "0.150000"
+FSIGMA = "1.000000"
+
+
+textures = "SamplerLUT1;SamplerLUT2"
+