[geary] (13 commits) Non-fast-forward update to branch mjog/plugin-support

[Michael Gratton <mjog src gnome org>]

The branch 'mjog/plugin-support' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  4ca5956... Add libpeas to the build
  3c80a87... Add PluginManager class for client plugin support
  3687f15... Convert NewMessagesMonitor into a plugin context
  3688234... Add a libpeas Plugin.Notification extension, hook it up
  e9a1305... Convert Notification.Desktop to a plugin

Commits added to the branch:

  e589713... Merge branch 'mjog/flatpak-json-to-yml' into 'mainline' (*)
  d3c6629... Bump files for 3.35.0 (*)
  8b26628... Add missing dates to last two releases in appdata (*)
  50d2a08... Bump required meson version to 0.50 (*)
  a872fc3... Add libpeas to the build
  c89766c... Add PluginManager class for client plugin support
  526b120... Convert NewMessagesMonitor into a plugin context
  e2e8e29... Add a libpeas Plugin.Notification extension, hook it up
  486c2fc... Convert Notification.Desktop to a plugin
  b54bbd4... Convert UnityLauncher to NotificationBadge plugin
  2637b6c... Convert Libmessagingmenu to MessagingMenu plugin
  5d13b8e... Ensure standard valac args are used when building plugins
  d5e7c05... Move InAppNotification class to components package

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