Photini

1/ Fix problem dragging onto map with some Python/Qt combinations.

1/ Regions tab image display is zoomable and draggable.
2/ Qt package preference can be changed in settings dialog.
3/ Selected image thumbnails use system "selected text" colour.
4/ Map marker colours can be changed in settings dialog.
5/ Better handling of missing WebGL in map tabs.
6/ Improved 'photini-post-install' command.
7/ Other minor improvements and bug fixes.

1/ Fix map tabs localisation problems on Windows.

1/ Revert to old "Mapbox" map if WebGL not available.

1/ New "Azure" map tab, will eventually replace "Bing" map tab.
2/ Improved "Mapbox" map tab.
3/ Show all image regions.
4/ Other minor improvements and bug fixes.

1/ Use deprecated Google Map marker with QtWebEngline v5.15.2 or lower.
2/ Copy files from camera in chunks.