Make the ChatWindow handle dropping items itself

Both GtkNotebook and EmpathChatWindow take action when drag-data-received is
signalled (moving the tab or adding a contact). Drag data is received after the
program has asked for it, usually when a drop occurs. Now this can be done in
two ways 0) Handle the drop signal yourself and call gtk_drag_get_data yourself
or 1) set GTK_DEST_DEFAULT_DROP and let gtk call it for you.

GtkNotebook takes option 0, EmpathyChatWindow decided to use option 1.. This
causes all kind of strange issues as the drag data is now requested twice and
thus the signal handlers are called twice causing all kinds of fun issues
(trying to move a tab that's already moved etc).

Change the drag dest flags to GTK_DEST_DEFAULT_HIGHLIGHT which provides some
extra visual clues but is other harmless and handle drops directly. Also remove
some cases where ChatWindow meddles with tab dragging as GtkNotebook will
handle these for us

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