[geary: 8/8] Merge branch 'mjog/folder-plugins' into 'mainline'

[Michael Gratton <mjog src gnome org>]

commit 686949118e160b700fc6a72d202607d3ceb72cf0
Merge: 1f54f117 55a9bfaf
Author: Michael Gratton <mike vee net>
Date:   Fri Mar 20 07:04:15 2020 +0000

    Merge branch 'mjog/folder-plugins' into 'mainline'
    
    Folder plugin support
    
    See merge request GNOME/geary!447

 po/POTFILES.in                                     |   4 +
 .../application/application-folder-context.vala    | 102 +++++++++++++++++++++
 .../application-folder-store-factory.vala          |  54 ++++++++++-
 .../application/application-main-window.vala       |  10 ++
 .../application/application-plugin-manager.vala    |  64 ++++++++++++-
 src/client/meson.build                             |   4 +
 src/client/plugin/plugin-application.vala          |  20 ++++
 src/client/plugin/plugin-button.vala               |  36 ++++++++
 src/client/plugin/plugin-folder-extension.vala     |  78 ++++++++++++++++
 src/client/plugin/plugin-folder-store.vala         |  19 ++++
 src/client/plugin/plugin-folder.vala               |   6 +-
 src/client/plugin/plugin-info-bar.vala             |  55 +++++++++++
 ui/application-main-window.ui                      |   1 +
 13 files changed, 446 insertions(+), 7 deletions(-)
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