plugin XEP-0264: updated size to get values closest to standard one:

- sizes used for thumbnails are now matching common resolutions.
- added BIG and FULL_SCREEN sizes
- sort thumbnails by sizes when parsing them.

sat/plugins/plugin_comp_file_sharing.py

@@ -434,7 +434,7 @@ class FileSharing:
 
         if mime_type is not None and mime_type.startswith("image"):
             thumbnails = extra.setdefault(C.KEY_THUMBNAILS, [])
-            for max_thumb_size in (self._t.SIZE_SMALL, self._t.SIZE_MEDIUM):
+            for max_thumb_size in self._t.SIZES:
                 try:
                     thumb_size, thumb_id = await self._t.generateThumbnail(
                         final_path,