implemented storing of appointments

+ attachments

next: attach links, tags

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.api/build.gradle.kts

@@ -1,6 +1,6 @@
 description = "OpenCloudCal : API"
 
 dependencies {
-    implementation("de.srsoftware:tools.util:1.2.2")
+    implementation("de.srsoftware:tools.util:1.2.3")
     implementation("org.json:json:20240303")
 }

de.srsoftware.cal.api/src/main/java/de/srsoftware/cal/api/Appointment.java

@@ -22,6 +22,8 @@ public interface Appointment {
 	 */
 	Optional<Coords> coords();
 
+	Appointment clone(long newId);
+
 	/**
 	 * Descriptive text of the event
 	 * @return the description
@@ -41,7 +43,6 @@ public interface Appointment {
 	 */
 	long id();
 
-
 	/**
 	 * get a json representation of this Appointment
 	 * @return a JSON Object