load local gpx/kml track

[legrostdg]

Thanks for you app, it's really great! It would be nice to be able to load local gpx (and/or kml) files.

[BishopGIS]

Partially duplicates #61 and nextgis/nextgismobile_android#18

[legrostdg]

OK. Sorry, I wasn't able to parse these bug reports :)

[BishopGIS]

Don't worry. I wrote this to have links to similar issues. When release this functionality, we will close them all.