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.
This seems to be about the same actually as what it was. But now the relation is in there.
I also made the right icon inherit as much as possible from the left icon so that if we change something, we only have to change it in the left icon.
Contributes to issue CURA-5876.
