Add the ignoreICC option to avifDecoder

[wantehchang]

This allows us to remove the ignoreColorProfile parameter from the
avifImageCreateView() function.

There is a change of behavior to avifdec:
The message "[--ignore-icc] Discarding ICC profile.\n" won't be printed
if the --ignore-icc or --icc option is specified and the image has an
ICC profile.

Bug: #3277

[maryla-uc]

Are you planning on porting this change to crabbyavif as well?

[wantehchang]

Thanks for the review. I've ported the avifDecoder::ignoreColorProfile option to CrabbyAvif as you suggested. (See CrabbyAvif feature request webmproject/CrabbyAvif#829 and Google internal CL cl/942193170.)

[wantehchang]

I also renamed the ignoreColorProfile field to ignoreICC. The original reason is that the name ignore_icc blends in better with the CrabbyAvif source code. A new reason is that the ignoreColorProfile parameter of the avifReadImage() function in apps/shared/avifutil.h also controls the setting of the colorPrimaries and transferCharacteristics fields when decoding a PNG input file:

// Reads an image from a file with the requested format and depth.
// ...
// May set the image's colorPrimaries, transferCharacteristics and ICC fields
// based on color information found in the image (unless ignoreColorProfile is true).
avifAppFileFormat avifReadImage(const char * filename,
                                avifAppFileFormat inputFormat,
                                avifPixelFormat requestedFormat,
                                int requestedDepth,
                                avifChromaDownsampling chromaDownsampling,
                                avifBool ignoreColorProfile,
                                avifBool ignoreExif,
                                avifBool ignoreXMP,
                                avifBool ignoreAlpha,
                                avifBool ignoreGainMap,
                                uint32_t imageSizeLimit,
                                avifImage * image,
                                uint32_t * outDepth,
                                avifAppSourceTiming * sourceTiming,
                                struct y4mFrameIterator ** frameIter);

So the ignoreICC name is more precise.