[Feature Request] Process from GPX Heart Rate

[snooppr]

It seems that Gpsprune is missing an important feature (of interest to athletes): processing heart rate values from a .gpx file. Very often, the gpx track contains heart rate values (many trendy bluetooth gadgets write it).

hr=110 example_1: <trkpt lat="55.00000" lon="41.00000"><ele>127.3</ele><time>2023-06-05T16:03:35Z</time><extensions><gpxtpx:TrackPointExtension><gpxtpx:hr>110</gpxtpx:hr></gpxtpx:TrackPointExtension></extensions></trkpt>

example_2:

<trkpt lat="55.000000" lon="41.00000">
<time>2023-06-13T16:50:04Z</time>
<extensions>
    <ns3:TrackPointExtension>
        <ns3:speed>0.5555556</ns3:speed>
        <ns3:cad>107.0</ns3:cad>
        <ns3:hr>110</ns3:hr>
    </ns3:TrackPointExtension>
</extensions>

Ideally do:

1. Output of heart rate at a point;
2. Total heart rate of the entire track (min.max. average);
3. Delete field value add field (remove all heart rate), privacy or any other reason
4. Display heart rate graph
5. Edit point add heart rate field
6. Go to point value (Minimum/Maximum HR value)
7. Perhaps it's worth doing the same for the file.kml/.kmz format (I won't say for these formats, since I always use .gpx).

Gps prune is a very high-quality software (my respect), but the lack of heart rate parsing in version 23, IHMO, is an omission.