allow access to job calculator factories and rename switcher to selector

Author: oblonski

jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/box/Jsprit.java

@@ -341,15 +341,15 @@ public Builder setJobFilter(JobFilter jobFilter) {
         /**
          * Set a custom service insertion calculator factory
          */
-        public Builder setServiceInsertionCalculatorFactory(ServiceInsertionCalculatorFactory factory) {
+        public Builder setServiceInsertionCalculatorFactory(JobInsertionCostsCalculatorFactory factory) {
             this.serviceCalculatorFactory = factory;
             return this;
         }
 
         /**
          * Set a custom shipment insertion calculator factory
          */
-        public Builder setShipmentInsertionCalculatorFactory(ShipmentInsertionCalculatorFactory factory) {
+        public Builder setShipmentInsertionCalculatorFactory(JobInsertionCostsCalculatorFactory factory) {
             this.shipmentCalculatorFactory = factory;
             return this;
         }