Add CSP-compatible shortcut scheme
I did my best to recreate Clip Studio Paint's default shortcut scheme based on reading its manual. I haven't used CSP myself and I haven't yet gotten any feedback from anyone who has in this thread, which has more details: https://krita-artists.org/t/a-default-csp-compatible-shortcut-scheme-in-canvas-input-settings/46186
Test Plan
Try out the shortcuts, make sure they are assigned as expected and don't have any conflicts.
Formalities Checklist
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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.