ajout des tests post-refactoring + correction de bugs

src/main/java/avatartranslator/AvatarSetTimer.java

.../avatartranslator/mutation/AddActionOnSignalMutation.java

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

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

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

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

...main/java/avatartranslator/mutation/MdRandomMutation.java

...in/java/avatartranslator/mutation/MdSetTimerMutation.java

...main/java/avatartranslator/mutation/RelationMutation.java

.../java/avatartranslator/mutation/RmResetTimerMutation.java

...in/java/avatartranslator/mutation/SwapActionMutation.java

...in/java/avatartranslator/mutation/TransitionMutation.java

...anslator/mutation/UnnamedStateMachineElementMutation.java

...l/src/test/java/avatartranslator/AvatarMutationTests.java