WebP & AVIF: Assortment export fixes

Rasyuqa A Hrequested to merge
rasyuqaa/krita:rasyuqaa/webp-strip-icc-and-avif-ui-bug into master

This MR proposed few fixes for file exports:

WebP: Add option to force convert to sRGB and ICC profile embedding

Closes BUG: 501358 and adds an option to force convert to sRGB as well.

webp-icc

AVIF: Fix export UI bug where quality slider sometimes got disabled when 'Lossless' is already off (lossy mode)

I discovered this minor bug back then, and to re-enable the quality slider I have to toggle Lossless setting on and off. This bug can be reproduced after saving a lossy AVIF and exporting another one (when the saved config is at lossy mode).

Test Plan

  • Build Krita

WebP:

  • Try to export non-sRGB images with 'Force convert to sRGB' option enabled and verify if the resulting file is correctly converted to sRGB
  • Try to export images with 'Save ICC Profile' option disabled and verify if the resulting file didn't have ICC profile attached

AVIF:

  • Check if quality slider is enabled when exporting with 'Lossless' option disabled

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
  • Does the patch add a user-visible feature? If yes, is there a documentation MR ready for it at Krita Documentation Repository? (WebP: no docs update yet; AVIF: no user-visible update)

Reminder: the reviewer is responsible for merging the patch, this is to ensure at the least two people can build the patch. In case a patch breaks the build, both the author and the reviewer should be contacted to fix the build. If this is not possible, the commits shall be reverted, and a notification with the reasoning and any relevant logs shall be sent to the mailing list, kimageshop@kde.org.

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