cache sort of addon on engine status change (#165)

this event occurs very regularly in the concurrent engine, this should
be put in cache like other frequent events

contributes to
#111

Signed-off-by: Didier Vojtisek <didier.vojtisek@inria.fr>

framework/execution_framework/plugins/org.eclipse.gemoc.executionframework.engine/src/org/eclipse/gemoc/executionframework/engine/core/AbstractExecutionEngine.java

@@ -201,7 +201,7 @@ protected final void notifyEngineAboutToDispose() {
 	}
 
 	protected void notifyEngineStatusChanged(RunStatus newStatus) {
-		for (IEngineAddon addon : getExecutionContext().getExecutionPlatform().getSortedEngineAddons(EngineEvent.engineStatusChanged)) {
+		for (IEngineAddon addon : getCachedSortedEngineAddons(EngineEvent.engineStatusChanged)) {
 			try {
 				addon.engineStatusChanged(this, newStatus);
 			} catch (Exception e) {