Figuring how files can be downloaded to implement GPXexport (#9). Also changing the icon used for GPX import.

src/theme/map.css

@@ -63,4 +63,8 @@ ion-modal ion-toolbar {
 ion-modal ion-content {
   background-color: rgba(255,255,255,.7)
   ;
+}
+
+.hidden {
+  display: none;
 }