Start tool to convert Osmand GPX to KML.

So far, converts A/V notes to placemarks.
Convert GPX track to KML <gx:Track>.
Render multiple GPS track segments as <gx:MultiTrack>.
Cleanup XML style structure.
Use <gx:MultiTrack><altitudeMode>clampToGround</altitudeMode>.
Render proper video icon.
Idenitfy note type (photo/audio/video) and use proper icon.
Don't show note name unless selected - they crowd view largely.