This restores the 1s delay before showing notification

Now, sorted adapter automatically sorts and activates DiffUtil moves
detection if needed

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

sed in Mac requires extension for backup file.

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Make it handle dataset too

Now called only once updates deque is empty

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Menu & sorting management are delegeted to ContentActivity and
SortableFragment now.
Menu items click management are dispatched to concerned fragments

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Close #323

As they are accessed from multiple threads