Photini

1/ Stopped using deprecated MapBox tile layers.
2/ Many minor bug fixes and performance improvements.

1/ Improved technical tab widgets. Units (e.g. mm) are now included in the
display instead of the label, and blank or multiple values are handled
better.
2/ Several other bug fixes.

1/ GPS coords address lookup is now on a separate tab.
2/ Map tabs now display altitude as well as latitude & longitude.
3/ File count shows progress during import.
4/ Added 'move files' option to importer.
5/ Added Czech and Catalan localisations.
6/ Better handling of some non-standard metadata values.
7/ Use FFmpeg instead of Exiv2 to read video file metadata.
8/ Updated Windows installers, including GPX file reader and FFmpeg option.

1/ Added new Google Photos uploader.
2/ Improved login process for both uploaders.
3/ Added GPX file (GPS track) importer to set approximate locations.
4/ Made Photini extendable - can add tabs from other packages.
5/ Improved reliability of maps, uploaders, and importer.

1/ Added thumbnail context menu item to show metadata changes.
2/ Use tabs to show 'camera' and multiple 'subject' addresses.
3/ Can now synchronise Flickr metadata with local picture file.
4/ Removed Google Photos uploader as the API it used is defunct.
5/ Improved reliability when using PyGObject instead of pgi.
6/ Improved error messages from GObject/GLib stuff.

1/ Removed Facebook tab. Their API no longer allows photo uploads.
2/ Added "Mapbox" tab - OpenStreetMap data plus aerial imagery.
3/ Many changes to maps, e.g. removing "load map" button.
4/ Use OpenCage for all address lookups.