[recipes] (19 commits) ...Update screenshots

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  16a5cf2... Add a function to format time differences (*)
  4515d75... Maintain a 'last changed' timestamp for favorites (*)
  20523e6... Slight format change for favorites.db (*)
  65c6965... Add a shopping list api (*)
  dbfe9f1... Add a Shopping List button to the action bar (*)
  cab7032... Add a temporary shopping cart icon (*)
  2676e00... Support querying the shopping list (*)
  7ad0066... window: Add api to show the shopping list (*)
  cd4e0cf... Add a new shopping list tile to the recipes page (*)
  e568346... Add a small tile variant for recipes (*)
  71045fe... Be safe against crash in the details page (*)
  d5a8aee... Update the empty list states (*)
  40ad0d8... Remove an outdated comment (*)
  3eed5de... Add api to get unformatted units for ingredients (*)
  86aafec... Add minimal merging for ingredient lists (*)
  e984623... Add a quick print implementation for shopping lists
  93b70ab... shopping list: Hide unimplemented buttons
  b545f96... Update appdata
  f61acb6... Update screenshots

(*) This commit already existed in another branch; no separate mail sent