Added tests for model-checker

...in/java/avatartranslator/modelchecker/SafetyProperty.java

src/main/java/cli/Action.java

ttool/src/test/java/cli/CLIAvatarModelCheckerTest.java

ttool/src/test/resources/cli/input/AirbusDoor_V2.xml

ttool/src/test/resources/cli/input/modelchecker_rl_expected

ttool/src/test/resources/cli/input/modelchecker_s_expected

ttool/src/test/resources/cli/input/scriptmodelchecker_n

ttool/src/test/resources/cli/input/scriptmodelchecker_rl

ttool/src/test/resources/cli/input/scriptmodelchecker_s