app: add option to stroke the warp tool during cursor motion ...
... and to disable/control the rate of the periodic stroke. The warp tool is now fast enough to enable stroking directly in the motion handler, which gives better-quality response to motion than stroking periodically. It's not quite fast enough to enable exact motion, though :/ Allow individually enabling/disabling stroking during motion and periodically, and allow controlling the rate of the periodical stroke.
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