[Wayland]: Add support for hold gesture #735
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This PR adds support for "hold" pointer gesture, introduced in libinput 1.19 and wayland-protocols 1.23.
Hold gestures are primarily designed for two interactions:
hold-to-interact: where a hold gesture is active for some time a menu could pop up, or some object is selected, etc.
hold-to-cancel: where e.g. kinetic scrolling is currently active, the start of a hold gesture can be used to stop the scroll
Since hold gestures by definition do not have movement, there is no need for an "update" stage in the gesture.
This is also bump
pointer-gestures-unstable-v1protocol to version 3