Minor fixes.
Fixed saving to class collection.
Fixed class selection.
Initial commit
Added deleting items from class lists with context menu and Delete. Added error boxes if Delete or F is pressed but no item is selected.
All XML files have been removed and moved to another project.
Favourites can be now also added by selecting item and pressing F.
Added possibility of appeding already added items to classes. Added items addition to all specs while chosing only class in ClassChoice window.