Process with native parsing first, then ExifTool (the default behaviour)

When running process, MT now defaults to using native parsers (exif, camm, gopro, blackvue) before falling back to ExifTool for any failures. This approach leverages our previous speedup work (#722, #729, #731, #721) making native parsing 3-10x faster than ExifTool, while maintaining ExifTool's broad format support.

If ExifTool is not found, a warning is printed:

2025-03-31 20:08:05,510 - WARNING - Skip "exiftool_runtime" because: [Errno 2] No such file or directory: 'exiftool2'

You can specify the path to your ExifTool installation with the MAPILLARY_TOOLS_EXIFTOOL_PATH environment variable. When not set, MT searches for ExifTool in your PATH.

Unified Geotag Source Options

Reused the same geotag option syntax here but standardized the support for both videos and images:

• --geotag_source=exif expands to {"source": "exif"} (applies to images only)
• --geotag_source=native,exiftool_runtime expands to [{"source": "native"}, {"source": "exiftool_runtime"}]

The --video_geotag_source option is now a convenience wrapper for --geotag_source that always targets videos:

• --video_geotag_source=exiftool_runtime expands to {"source": "exiftool_runtime", "filetypes": "video"}