Fix handling of scroll events, fix auto-hide on compositors where intellihide isn't supported, refactor #476
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Don't multiply absolute scroll events by 120, and handle
value120scroll events.Without this, pop-os/cosmic-applets#1102 doesn't work properly. The existing version of that applet still seems to work fine with this change as well.
Also includes an earlier change I hadn't PR'ed to fix auto-hide behavior on compositors other than cosmic-comp, and some refactoring. Those shouldn't have any impact on behavior on cosmic-comp.