Add clustering of entities

When moving entities to avoid intersection, the Hass entities are first
grouped together into clusters. Then these clusters are separated from
 each other instead of the Hass entities individually.

src/com/shmuelzon/HomeAssistantFloorPlan/Controller.java

@@ -1067,12 +1067,17 @@ private void separateStateIcons(Set<? extends Entity> entities) {
     }
 
     private void moveEntityIconsToAvoidIntersection() {
+        List<ClusterEntity> clusters = clusterEntities(homeAssistantEntities.values());
+
         for (int i = 0; i < 100; i++) {
-            List<Set<Entity>> intersectingStateIcons = findIntersectingStateIcons();
-            if (intersectingStateIcons.isEmpty())
+            List<Set<Entity>> intersectingStateIcons = findIntersectingStateIcons(clusters);
+            if (intersectingStateIcons.isEmpty()) {
                 break;
-            for (Set<Entity> set : intersectingStateIcons)
+            }
+
+            for (Set<Entity> set : intersectingStateIcons) {
                 separateStateIcons(set);
+            }
         }
     }
-};
+}