Rename packing functions for consistency

Assets/ScriptableRenderPipeline/ShaderLibrary/Packing.hlsl

 //-----------------------------------------------------------------------------
 
 // Ref: http://realtimecollisiondetection.net/blog/?p=15
-float4 PackLogLuv(float3 vRGB)
+float4 PackToLogLuv(float3 vRGB)
 {
     // M matrix, for encoding
     const float3x3 M = float3x3(
     return vResult;
 }
 
-float3 UnpackLogLuv(float4 vLogLuv)
+float3 UnpackFromLogLuv(float4 vLogLuv)
 {
     // Inverse M matrix, for decoding
     const float3x3 InverseM = float3x3(
 }
 
 // The standard 32-bit HDR color format
-uint PackR11G11B10f(float3 rgb)
+uint PackToR11G11B10f(float3 rgb)
 {
     uint r = (f32tof16(rgb.x) << 17) & 0xFFE00000;
     uint g = (f32tof16(rgb.y) << 6) & 0x001FFC00;
 
-float3 UnpackR11G11B10f(uint rgb)
+float3 UnpackFromR11G11B10f(uint rgb)
 {
     float r = f16tof32((rgb >> 17) & 0x7FF0);
     float g = f16tof32((rgb >> 6) & 0x7FF0);
     return saturate(i * rcp(maxInt));
 }
 
-// Unpacks a [0..1] float into an integer using at most 'numBits'.
+// Unpacks a [0..1] float into an integer of size 'numBits'.
 uint UnpackInt(float f, uint numBits)
 {
     uint maxInt = 0xFFFFFFFFu >> (32u - numBits);
     return float(BitFieldExtract(src, numBits, offset)) * rcp(maxInt);
 }
 
-uint PackR10G10B10A2(float4 rgba)
+uint PackToR10G10B10A2(float4 rgba)
-float4 UnpackR10G10B10A2(uint rgba)
+float4 UnpackFromR10G10B10A2(uint rgba)
 {
     float4 ouput;
     ouput.x = UnpackUIntToFloat(rgba, 10, 0);