[geary/mainline] (25 commits) ...Merge branch 'wip/135-contact-popovers' into 'mainline'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  680f46c... Add initial contact popover UI and implementation (*)
  e144617... Update conversation message menus and actions for contact p (*)
  b9d6c26... Implement New Conversation action (*)
  3d6ef3d... Remove now-unsed param from controller method (*)
  5ce9aa3... Stop passing the avatar store all the way down to conversat (*)
  5339a6c... Add client Contact and ContactStore classes (*)
  ccd3439... Use client contact classes in the conversation viewer (*)
  a5c8791... Convert conversation message's address UI widget to a conta (*)
  5a68152... Lookup and use Folks individuals in client contact classes (*)
  0e3d6bc... Use contacts in ConversationMessage to display originators/ (*)
  6ff0e70... Update converation message details when a client contact ch (*)
  258b68b... Update ContactPopover depending on if the contact is from t (*)
  948ed5f... Only hide email address when displaying a contact name if i (*)
  68b2da1... Separate and implement contact popover action from conversa (*)
  41d061c... Implement save contacts and open desktop contacts in Contac (*)
  73159ba... Add new generic LRU cache to the client (*)
  2a11005... Use LRU cache ContactStore for caching Contact objects and  (*)
  8d4a029... Update AvatarStore to load from contacts rather than mailbo (*)
  863e62c... Minor ConversationListBox tweaks (*)
  e4e1da3... Don't use the engine contact's display name (*)
  53f0686... Start loading remote images if pref enabled via sender's co (*)
  44b01a8... Fix sender names from GitLab, Discourse, etc displayed with (*)
  10051e0... Implement spoofed email address UI for ContactsPopover (*)
  ffaa43c... Tweak spoofed email warning UI (*)
  a83a68e... Merge branch 'wip/135-contact-popovers' into 'mainline'

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