Automatic touch painting

Carsten Hartenfelsrequested to merge
hartenfels/krita:feature/issue-28 into master

Makes it so that toggling touch painting no longer requires restarting Krita and implements automatic touch painting as described in #28 (closed).

Docs MR: documentation/docs-krita-org!366 (merged)

Test Plan

  • Start Krita, observe that the default touch painting setting is Auto (Enabled).
  • Create a canvas and touch it, observe that it paints.
  • Bring a stylus near the device, then touch the canvas, observe that it pans the canvas and that the touch paint setting has changed to Auto (Disabled).
  • Restart Krita, observe that the setting is back to being enabled.
  • Manually enable and disable the setting and observe that Krita behaves accordingly without needing to restart it.

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.

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