shotwell 0.31.0 release:

• Reorganize source tree
• Visually clean-up saved search editing dialog
• Use org.freedesktop.FileManager1 instead of calling nautilus directly.
• Fix some deprecated calls in faces code
• Fix icon fall-back
• Add support for reading WEBP
• Some appdata fixes
• Skip hidden folders such as .thumbnails
• Fix missing icons in sidebar
• Use Gtk.FileChooserNative for nicer portal integration
• flatpak: several updates of dependencies
• flatpak: strip-down OpenCV
• Fix another "unknown source-id" warning
• Stop spinning the event loop when changing window cursors
• Several fixes to scroll events
• Fix tooltips on overview pages
• Fix issue with ImageHeight and ImageWidth mix-up
• Strip diacritics from events and tags for better searching
• Support gexiv2 0.12
• Add -p/--show-metadata option to Shotwell for dumping meta-data
• Increase comment limit to 4k chars
• Fix deprecations in Piwigo builder files
• Do not make Cancel the default action in the authenication panel
• Clean-up in several places in the publishers
• Split-up some of the publishing panel code and move to GtkBuilder
• Simplify the login landing page for publishing
• Remove non-functional Facebook publisher code
• Split-up CheckerBoardLayout.vala file
• Use nicer messages on empty filters etc.
• Merge face recognition code
• Fix fall-back icon for cameras
• Fix CSS and icon theme initialization code
• Fix an issue with chaining up the constructors for the main window classes
• Fix issue with ACDSEE tags parser attaching all known tags to all imported images
• Mege Map support
• Use my mapbox API token for map support
• Minor refactor of Page.vala eliminating duplicated code
• Drop conditionals for old Vala
• Several fixes with recent Vala versions
• Page.vala code split-up
• Various typo fixes
• Fix issue with artist containing an email address
• Add optional private DBus communication for faces recognition binary