refactoring constructeurs

src/main/java/avatartranslator/mutation/ActionMutation.java

...ava/avatartranslator/mutation/ActionOnSignalMutation.java

...ain/java/avatartranslator/mutation/AddActionMutation.java

.../avatartranslator/mutation/AddActionOnSignalMutation.java

...ava/avatartranslator/mutation/AddAssociationMutation.java

.../java/avatartranslator/mutation/AddAttributeMutation.java

...main/java/avatartranslator/mutation/AddBlockMutation.java

...ava/avatartranslator/mutation/AddExpireTimerMutation.java

...ain/java/avatartranslator/mutation/AddMethodMutation.java

src/main/java/avatartranslator/mutation/AddMutation.java

...ain/java/avatartranslator/mutation/AddRandomMutation.java

...n/java/avatartranslator/mutation/AddRelationMutation.java

...java/avatartranslator/mutation/AddResetTimerMutation.java

...n/java/avatartranslator/mutation/AddSetTimerMutation.java

...ain/java/avatartranslator/mutation/AddSignalMutation.java

...main/java/avatartranslator/mutation/AddStateMutation.java

...java/avatartranslator/mutation/AddTransitionMutation.java

...n/java/avatartranslator/mutation/AssociationMutation.java

...ain/java/avatartranslator/mutation/AttributeMutation.java

src/main/java/avatartranslator/mutation/AvatarMutation.java