Don't dispatch change events when reading features

Based on initial work by https://github.com/Jinkwon

src/ol/format/IGC.js

@@ -159,7 +159,7 @@ class IGC extends TextFeature {
     const layout = altitudeMode == IGCZ.NONE ? GeometryLayout.XYM : GeometryLayout.XYZM;
     const lineString = new LineString(flatCoordinates, layout);
     const feature = new Feature(transformGeometryWithOptions(lineString, false, opt_options));
-    feature.setProperties(properties);
+    feature.setProperties(properties, true);
     return feature;
   }