[feature] Reordering of favourites

[n-o-o-b]

Allow custom order of favourites.

This could be implemented by adding 'move up' and 'move down' options to the long-press menu for favourites, like the ones in KISS for widgets. However, this would not work well if there are lots of favourites as it would be tedious to move something far up or down the list. However, it would be a start. A superior solution would be a drag-to-reorder menu.