Removed serialization of event detectors.

src/changes/changes.xml

src/main/java/org/orekit/attitudes/AttitudesSequence.java

...timation/measurements/generation/EventBasedScheduler.java

...ain/java/org/orekit/forces/maneuvers/ImpulseManeuver.java

...a/org/orekit/forces/radiation/SolarRadiationPressure.java

.../java/org/orekit/propagation/events/AbstractDetector.java

...n/java/org/orekit/propagation/events/AdapterDetector.java

...java/org/orekit/propagation/events/AlignmentDetector.java

.../java/org/orekit/propagation/events/AltitudeDetector.java

.../orekit/propagation/events/AngularSeparationDetector.java

...in/java/org/orekit/propagation/events/ApsideDetector.java

...n/java/org/orekit/propagation/events/BooleanDetector.java

...rekit/propagation/events/CircularFieldOfViewDetector.java

...main/java/org/orekit/propagation/events/DateDetector.java

...n/java/org/orekit/propagation/events/EclipseDetector.java

...java/org/orekit/propagation/events/ElevationDetector.java

.../orekit/propagation/events/ElevationExtremumDetector.java

...ain/java/org/orekit/propagation/events/EventDetector.java

...ekit/propagation/events/EventEnablingPredicateFilter.java

...main/java/org/orekit/propagation/events/EventShifter.java