deprecate: deprecate addCustomControls method

Use setCustomControls instead.

Close #127

src/main/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMap.java

@@ -747,7 +747,10 @@ public LatLonBounds getBounds() {
    * Adds custom control buttons to the map.
    * 
    * @param customControls list of custom controls to add to the map
+   * 
+   * @deprecated {@link #setCustomControls(CustomControl... customControls)} should be used instead.
    */
+  @Deprecated
   public void addCustomControls(CustomControl... customControls) {
     JsonArray jsonArray = Json.createArray();
     for (int i = 0; i < customControls.length; i++) {
@@ -758,4 +761,20 @@ public void addCustomControls(CustomControl... customControls) {
     }
     this.getElement().setPropertyJson("customControls", jsonArray);
   }
+
+  /**
+   * Sets the custom control buttons to be displayed in the map.
+   * 
+   * @param customControls list of custom controls to add to the map
+   */
+  public void setCustomControls(CustomControl... customControls) {
+    JsonArray jsonArray = Json.createArray();
+    for (int i = 0; i < customControls.length; i++) {
+      CustomControl customControl = customControls[i];
+      jsonArray.set(i, customControl.getJson(i));
+      customControl.getControlButton().getElement().setAttribute("slot", "customControlSlot_" + i);
+      this.getElement().appendChild(customControl.getControlButton().getElement());
+    }
+    this.getElement().setPropertyJson("customControls", jsonArray);
+  }
 }

src/test/java/com/flowingcode/vaadin/addons/googlemaps/GeolocationDemo.java

@@ -52,7 +52,7 @@ protected void createGoogleMapsDemo(String apiKey) {
     currentLocationButton.setClassName("geolocation-button");
     CustomControl geolocationControl =
         new CustomControl(currentLocationButton, ControlPosition.TOP_CENTER);
-    gmaps.addCustomControls(geolocationControl);
+    gmaps.setCustomControls(geolocationControl);
 
     gmaps.addCurrentLocationEventListener(e -> gmaps
         .addMarker(new GoogleMapMarker("You are here!", gmaps.getCenter(), false, Markers.GREEN)));