Feature/heat map

[Skrohk]

This MR implements a new tab, a heat-map showing all the athlete activities on one map, it's a straightforward way to visualize where you go the most and where you don't go. This tab is only available in the Desktop app. The activities can be filtered depending on their type.

The MR is inspired by the project : derive.

A few issues:

• because I have always used leaflet for personal projects, the map is implemented with leaflet and not mapbox.
• it's my first project with Angular.js and I have a slight reactivity issue. When clicking on "Computing" the UI freeze and does not display the loading icon.

I have not generated a new production installer because I prefer to wait for your feedback on the code before doing it.

[Skrohk]

@thomaschampagne

[thomaschampagne]

Hi @Skrohk !

Thanks for this amazing work. That's a great feature !

I will handle your PR in upcoming weeks. I'm pretty busy at the moment.

Thanks again for this work !

Thomas