Introduce a new PanBackend for the gesture tracker #2095
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This will allow exact finger tracking for touchscreen devices. Once used this will f*x #1272
Currently this isn't used anywhere but it prepares for handling all touchscreen gestures with this in order to achieve one to one finger tracking. In the long term with some coming mutter changes it will handle all gestures (touchpad as well) in order to remove the need of touchegg which currently only works because of xwayland.
This will also allow us to have much more precise gestures: e.g. swipe up from the bottom to reveal the dock one to one will be trivial to implement (PR incoming). It can also be used to do swipe in from corners to use hotcorners on touchscreen (another PR incoming :) ).
The ugly workaround with toucheggbackend.ignore_touchscreen can be removed once everything uses the new pan backend for touchscreen gestures by just ignoring all touchscreen events from touchegg.
TODO: