Round export button in infowindow

[asemoller]

Closes #1220.

Makes it possible to have round exports button when "infowindow": "infowindow".
This PR also includes a change to the simpleExport structure in the json file.

Config for clientExport with text button, simpleExport with new structure and round button and layerSpecificExport with round button:

"clientExport": {
   "format": "geojson",
   "buttonText" : "Exportera fil",
   "layers": [ "lager_1", lager_2" ],
   "button": {
      "buttonText": "Exportera fil",
      "roundButton": false
   }
},
"simpleExport": {
   "url": "xxx/origoserver/excelcreator",
   "layers": [ "lager_1" ],
   "button": {
      "roundButton": true,
      "roundButtonIcon": "#fa-download",
      "roundButtonTooltipText": "Ladda ner excelfil"
      }
 },
"layerSpecificExport": [{
   "layer": "lager_2",
   "attributesToSendToExport": ["name"],
   "exportUrls":[{
      "url": "xxx",
      "exportedFileName": "filename_1.xlsx",
      "button": {
         "roundButton": true,
         "roundButtonIcon": "img/png/export_knapp_excel.png",
         "roundButtonTooltipText": "Ladda ner excelfil"
         }
      }]
  }]

We think it's cleaner to have the same structure for all the export functions. Please note that these changes doesn't work with old json files.

If we need to make an issue for restructuring the simpleExport, please let us know.

[jokd]

@asemoller Is it possible for you to solve the conflicts and then I'll merge this?

[asemoller]

Has probably something to do with the spinner and that's above my level 😃. I can give it a try though!

[asemoller]

I can resolve the conflicts but there's a css problem with the spinner that I don't know how to fix 😞!

[jokd]

LGTM