Fix: Marker-Schleifen bei Globus-Bewegung

CLAMP_TO_GROUND durch NONE ersetzt bei Schiffen, Erdbeben, GDELT.
CLAMP_TO_GROUND verursacht Positionsneuberechnung gegen Terrain
bei jeder Kamerabewegung, was zu sichtbarem Mitschleifen fuehrt.

static/js/layers/gdelt.js

@@ -47,7 +47,7 @@ const GdeltLayer = {
                         color: Cesium.Color.fromCssColorString('#ff8800'),
                         outlineColor: Cesium.Color.fromCssColorString('#663300'),
                         outlineWidth: 1,
-                        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
+                        heightReference: Cesium.HeightReference.NONE,
                         disableDepthTestDistance: Number.POSITIVE_INFINITY,
                     },
                     description: '<div style="font-family:monospace;font-size:12px;color:#ff8800">' +

static/js/layers/quakes.js

@@ -56,7 +56,7 @@ const QuakesLayer = {
                         outline: true,
                         outlineColor: color.withAlpha(1.0),
                         outlineWidth: 1,
-                        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
+                        heightReference: Cesium.HeightReference.NONE,
                     },
                     description: '<div style="font-family:monospace;font-size:12px;color:#ff6644">' +
                         '<strong>M' + mag.toFixed(1) + '</strong> ' + (p.place || '') + '<br>' +

static/js/layers/ships.js

@@ -49,7 +49,7 @@ const ShipsLayer = {
                         color: color,
                         outlineColor: Cesium.Color.fromCssColorString('#112244'),
                         outlineWidth: 0.5,
-                        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
+                        heightReference: Cesium.HeightReference.NONE,
                         disableDepthTestDistance: Number.POSITIVE_INFINITY,
                     },
                     label: {