Renamed status listener into event listener

cameo-api/pom.xml

cameo-api/src/main/java/fr/ill/ics/cameo/Application.java

cameo-api/src/main/java/fr/ill/ics/cameo/EventListener.java

cameo-api/src/main/java/fr/ill/ics/cameo/Server.java

...-api/src/main/java/fr/ill/ics/cameo/impl/EventThread.java

...api/src/main/java/fr/ill/ics/cameo/impl/InstanceImpl.java

...o-api/src/main/java/fr/ill/ics/cameo/impl/ServerImpl.java