Mapillary

Adding support for uploading Mapillary image to Commons.

Left TODO:
Formatting, e.g. replacing "check Mapillary" buton with "Upload Mapillary" button.
Adding WLM info to image.
How to deal with images without a location (filename and description is missing).
How to find a category to add to the image.
Enabling uploading without the middle-step (needs testing for stability and all other issues resolved)