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Add support for high resolution scrolling

Vlad Zahorodnii requested to merge work/zzag/high-resolution-scrolling into master

In libinput 1.19, three new pointer axis events were added in order to provide support for high-resolution scrolling.

LIBINPUT_EVENT_POINTER_AXIS is de-facto deprecated and new users of libinput should use instead SCROLL_WHEEL, SCROLL_FINGER, and SCROLL_CONTINUOUS.

Discrete deltas were replaced with v120 delta values. 120 corresponds to a single discrete delta. Smaller values correspond to "partial" wheel ticks.

Edited by Vlad Zahorodnii

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