(chore) cleanup and factorize Switch component

[kounkou]

Description

This PR contains the factorization of the Switch component. Usage of the Switch now depends on the following properties, and signals :

SwitchDelegate {
    id: root

    property alias switchText: root.text
    property alias switchChecked: root.checked
    property alias switchEnabled: root.enabled

    signal checkedChangedExternally(bool checked)

    ...
}

Tests

• Tested that the code still works as usual
• Tested that the Switch still behaves as usual