Add Icons, Compact and Details view to the filewidgets.
Added an "Allow Expansion" menu option to toggle between Detailview and DetailTreeView
Moved KDirOperatiorIconView to its own class file.
Set default icon size for Icons view to 64px (piggy back D12326)
Add a zoom factor specific to compact view (aka simple view with left icons)
Based on P388 and D21283
Fixes "Make the view modes match the ones in Dolphin (e.g. Icons, Compact, and Details, with an option for "Allow expansion" in the settings menu" of T8552