Brush Tool: Pixel Art Line Algorithm

Currently Krita from KDE doesn’t have a Pixel Perfect option, the name for an algorithm that visually smoothes out pixel art curves. The idea here is that whenever the user ends up with a L-shape with this option, it would smartly remove corner pixels so that the overall curvature looks less blocky and more clean. By introducing this functionality, Krita users looking to utilize the pixel art functionalities alongside with Krita’s features can have an easier time controlling the precision and aesthetics of their pixel art creations.

For those interested here's a week by week update blog https://kenlo.hashnode.dev/?source=top_nav_blog_home

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?

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.