This refactors the homescreen state object to isolate drag & drop from
swipe states, allowing for using proper system-level drag & drop for delegate
movement. This then ports the new applet list to use it.
This ensures extraneous signals from being emitted when values don't
change in y animations. This fixes the vkbd in the search widget getting
in a weird stuck state due to multiple focuses on the search widget.
Fixes a bug where if one presses and holds the home screen to bring up the settings component, then swipes up to access the application drawer while the settings component open animation is playing, both the drawer and settings component will be visible on screen at the same time. Fixing this was achieved by setting swipe state back to none whenever the settings component is opening and a onSwipeMove event happens.
Video of the bug.

Currently delegates do not get deleted when removed from models. Due to
the complexity of drag state and other objects, we can't simply delete
the delegate when removed from the model because they might still be
involved in animations or other state at the time of removal. Use smart
pointers to have the delegate objects deleted instead.
QML unfortunately doesn't support QSharedPointer, so we need to expose raw pointers to it.
This fixes an issue where if the device is rotated in a folder, the page would not snap immediately back to the right position, but would instead animate icon position changes.
To achieve this, the following changes were made.
- changes were made to how the folder gird size is calculated to prevent an issue with the grid size changing for a brief period of time during screen rotation, causing problems with snapping to the correct page.
- icons position animations are now done by a animated index value to prevent it from animating when the device rotates
- when the device screen size changes (ex: device rotation), it now snaps to the current folder page, as before it would just stay in between the two pages.
This fixes an issue where if the device is rotated on the 2nd or further page, the page would not snap immediately back to the right position, but would instead animate.
SwipeArea requires 10px to differentiate between taps and swipes. HomeScreenState uses a further 10px to differentiate between vertical and horizontal swipes. This MR combines the swipe detection together so that we only need 10px rather than 20px for gesture detection.