xi: Implement support for XI 2.4 touchpad gestures
This implements support for XI 2.4 touchpad gestures described in a spec draft in this MR: xorg/proto/xorgproto!18
The MR effectively routes libinput touchpad swipe and pinch events throughout the X server.
The MR can effectively divided into three parts:
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First 9 commits that perform trivial refactoring that affects the rest of X server code. It may make sense to merge these commits earlier as that would make the review of the rest of PR easier. I guess that requires an agreement that the PR is good in principle.
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All other commits except p12tic/xserver@20fe52f8 implement straightforward logic.
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p12tic/xserver@20fe52f8 which implements actual gesture processing logic and will need really careful review.
Related MRs:
libinput input driver: xorg/driver/xf86-input-libinput!17
libXi: xorg/lib/libxi!5
CI is broken because the MR depends on unreleased xorg-proto