.fit files parsing

[borja]

Our code supports GPX files when adding/updating a workout.

We should support .fit files too (like the ones exported by garmin devices).

Some resources:

​https://github.com/dtcooper/python-fitparse

​https://github.com/K-Phoen/python-fitparse

[borja]

Milestone renamed

[borja]

Milestone renamed

[borja]

Implemented here: from [26/OpenWorkouts-current] to [29/OpenWorkouts-current].

Workflow:

• user clicks on "upload workout

• user provides a fit file

• fit file is stored as Workout.fit_file

• data from the fit file (sport, name, elevation, distance, speed, heart rate, cadence, temperature) is gathered and stored in attributes of the Workout model

• if the fit file contains gps data (latitude, longitude, distance, etc), a gpx file is generated from the fit file, stored in Workout.tracking_file, so we can show the proper data to the user using the current gpx-ready code in the workout details page. (this covers part of ticket #26)

[borja]

Tested throughly with different fit files from different devices, with/without extra data like heartrate, cadence, temperature or speed sensor data.

I'm closing this ticket as the basic implementation is done, let's open new tickets if needed for improvements/bugfixes as needed.