Conflicts:
plugins/PrepareStage/PrepareMenu.qml: Git was wrong, this was not really a conflict.
resources/qml/ActionButton.qml: With iconSource being modified on ui_rework_4_0 and me modifying the icon to be able to display it on the left hand side.
resources/qml/ActionPanel/OutputProcessWidget.qml: Git was wrong, not really a conflict.
resources/qml/ActionPanel/SliceProcessWidget.qml: Git was wrong, not really a conflict.
resources/qml/ExpandableComponent.qml: Both ui_rework_4_0 and me implemented a border around popups.
resources/qml/MainWindow/MainWindowHeader.qml: Git was wrong, not really a conflict.
resources/themes/cura-light/theme.json: Theme item was added in a place where I added whitespace.
These two fonts are exactly the same, but I want to use the 'small' font to be something a bit smaller. I'm 'removing' the superfluous font but will be re-using it immediately to look a bit smaller.
Contributes to issue CURA-5876.