Create a new class if members are pasted onto the board

If a member copy/cut paste operation ends on the board, we could create a new class and immediately add the members there. Keep in mind that we also have to undo/redo the operation correctly.

The same could work for moving members on the board, e.g., if the users moves a member onto the board while pressing a special key, a class could automatically be created where the members are then added. Keep in mind that a special key is already used to either move or copy elements during movement.