Swiss Regions: Add overview Map

[fridlmue]

As the usage of the micro regions for the Avalanche Reports in Switzerland seems not be common, it would be a good idea to include some "helper" map.

I could extract this from here, which is a HTML Image Map.

Now there needs to be a nice way to convert that in a (zoomable) "map" in QML showing the right region on click or, in best case, directly pushes the DangerPage_swiss.qml on the stack with the right RegionID.

As long term concept it for sure would be nice to implement a visual indication of the current GPS position and make all of the map geo referenced.

• [ ] Implement Map in QML
• [ ] Map Zoomable
• [ ] Informative On-Click Behavior
• [ ] Current GPS-Position on Map

Finally this could also be used for other regions offering similar shapes for the Micro Region. ALBINA-Regions for sure do. But for the Swiss Regions it seems to be more urgent.

Links to ideas or concepts how to solve that task in QML/Silica are very welcome, as I'm not to familiar.

[fridlmue]

Shapes for Austrian (and probably more) Map-Overlays could be found here: https://www.avalanche-warnings.eu/storage/geojson/aut.json

[fridlmue]

Covered by #31