feat: add QML setting popup

[acolombier]

Add QML setting section popup. Note that the legacy setting window can still be displayed by long pressing the setting button.

This also add a setup to allow setting search. Currently, setting search activation will automatically activate the setting in the UI, but it is also to bind the Mixxx.SettingGroup.onActivated signal to add more animation (e.g to highligh an input/output in the soundgraph)

[Swiftb0y]

couple thoughts. overall pretty nice. Building locally right now to sanity test.

[acolombier]

pre-commit failures depend on qarmin/qml_formatter#7

[acolombier]

@Swiftb0y this is where that setting is used. Without this switch, the Windows VM I used to test (which has software acceleration) will max out CPU when opening the popup.
Now I don't want to degrade the look of the new interface just to accommodate unorthodox setup (e.g testing VM) but going forward, we will need to support weaker setups if that makes sense

[Swiftb0y]

LGTM otherwise. Thank you.

[acolombier]

Done and squashed!

[Swiftb0y]

build fails... I'm pretty sure QNamespace is not a thing. <qnamespace> is probably a transient private dependency in QObject and you want to include the latter instead.

[acolombier]

It is indeed <Qt>! I updated after the build failed locally, but I didn't save before committing... 😅

[acolombier]

Now failing due to issues mitigated by #14740

[Swiftb0y]

LGTM. Thank you.