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Draft: Spectral blend as in spectral.js

Ronald van Wijnen requested to merge rvanwijnen/krita:spectral_blend into master

Implemented Spectral blending using Kubelka-Munk. This is basicly a port of spectral.js (https://github.com/rvanwijnen/spectral.js).

Test Plan

(Tell us how to test the changes you made.)

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.

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