Small changes to buttons

Update image refs

Update buttons and related widgets

Update notebook and headerbar

Tweak progressbars

Update toolbars and headerbars

Update menus/popovers, remove vertical margin to checkradio boxes

Update menus, popovers and dialogs

Update menus

Update GTK4 entries

Update switch controls

Update scrollbars

Update menubars

Add override to delete button image

Update scale