SG-44518: 1362: feature: Pixel Inspector optionally returns raw pixel values

[bsloan666]

This change modifies CommandsModule::sourcePixelValue() so that it returns the viewed file's raw pixel values when "Ignore File Primaries" is checked in RV's color menu. The normal behavior is to convert the linear RGB values in the file to a Rec709 gamut if the color primaries of the input file pixels are known.

This is particularly useful when viewing ACES EXR media and verifying that a sampled pixel value is the same as when sampled in other applications such as Nuke or OpenImageIO

Three source files are changed:

• src/lib/image/TwkFB/TwkFB/Operations.h
• src/lib/image/TwkFB/Operations.cpp
• src/lib/app/RvApp/CommandsModule.cpp

This has been tested on MacOS Sequoia 15.3.1 using the 2024 VFX platform configuration.

[linux-foundation-easycla]

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