Get track characteristics

Process a GPX track with gpxpy to get basic track characteristics: start date/time, duration, distance, elevation, type (run/ride), …

mentioned in issue #3

added TODO feature labels

removed TODO label

added TODO label

created merge request !3 (merged) to address this issue

mentioned in merge request !3 (merged)

added WIP label and removed TODO label

assigned to @freezed

mentioned in commit 63c02074

mentioned in commit 436f8fda

marked this issue as related to #3

mentioned in commit ec958ce6

mentioned in commit be0bca62

closed with merge request !3 (merged)

mentioned in issue #8 (closed)

removed WIP label

mentioned in commit 79a19d6b

mentioned in commit 6d2b44d7