[geary] (16 commits) ...Merge branch 'wip/3.32-avatars' into 'master'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  d93e5fe... Update avatar size to be 48px, per recommendation (*)
  742aca2... Add build dependencies for Folks (*)
  c12bdcd... Load avatars from Folks (*)
  786b3b0... Add basic Folks individual and pixbuf cache to AvatarStore (*)
  cf793bf... Evict from the avatar cache using LRU so it dosn't grow unb (*)
  d2bafee... Fix avatar cache not differentiating between senders w/ dif (*)
  9306d7c... Port GNOME 3.32 avatar code to vala, use when Folks avatar  (*)
  f9ef649... Don't bother setting default icon for the ConversationMessa (*)
  18039ed... Remove avatar URL setting and config now it is unused (*)
  4d1e86e... Add feature to appdata for next release (*)
  4e484e2... Make TestCase.assert_string robust in the face of null actu (*)
  76ee075... Make avatar code a bit more robust in the face of bad input (*)
  31aa176... Clean up client email util source file (*)
  133167d... Add a common interface for accessing headers from email cla (*)
  6c8f192... Attempt to de-mangle From names from Mailman, GitLab, etc (*)
  791c321... Merge branch 'wip/3.32-avatars' into 'master'

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