Add support for .fit files

Szymon Kłos requested to merge eszkadev/gnome-maps:feature/fit-support into main

Fit files are used by popular Garmin sportwatches.

Added fit file parser into togeojson library code. That library seems to be deprecated and no longer supported by developers.

Current implementation looks for points recorded in the file and joins them into single path.

Implements #571 (closed)

Edited by Marcus Lundblad

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