Support TCX files
Add auto split function.

Splits track spanning multiple days.
Better resiliance importing tracks which don't all have lat/lon points
Better names for cropped tracks
Import tracks straight from Strava.

(Exporting to GPX is a premium feature)
Simple Open Proxy is to avoid Cross-Origin-Requests to Strava API
Try to recover from failed attempts to load elevation point

Also load in batches for better liklihood of succeeding in the first place.
Fix bug with file name when exporting track with no time data.
Add Ordnance Survey layer to Map
Merge branch 'master' of https://github.com/IJMacD/gpstools.git