Draft: kcm: Add mobile/touch interface
The KCM UX currently is not very usable on mobile, because settings are applied immediately and sliders are not a particularly great control on mobile. This MR experiments with adding a second interface implemented with FormCard for mobile purposes (only shown when QT_QUICK_CONTROLS_MOBILE=1).
Big TODO, currently I made a clone of the output panel which has a ton of copy pasted code for every control. I need to figure out how to share code between the two UIs...
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Edited by Devin Lin