Previously it would say 'preparing to slice'. Now it just says 'auto slicing' but with an indeterminate progress bar. Only the indeterminate progress bar just appears empty right now...
Contributes to issue CURA-5997.
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.
