Adding a file chooser to import GPX files

src/theme/map.css

@@ -12,3 +12,12 @@ ion-button.get-location {
   --ion-background-color: white;
   margin-left: calc(50% - 20px);
 }
+
+.input-file {
+	width: 0.1px;
+	height: 0.1px;
+	opacity: 0;
+	overflow: hidden;
+	position: absolute;
+	z-index: -1;
+}