Switching to java 11 and gradle 7: first step

.idea/runConfigurations/TTool.xml

build.gradle

gradle/wrapper/gradle-wrapper.properties

graphminimize/build.gradle

graphshow/build.gradle

launcher/build.gradle

rundse/build.gradle

simulationcontrol/build.gradle

src/main/java/attacktrees/AttackTree.java

src/main/java/avatartranslator/AvatarStateMachine.java

...ain/java/avatartranslator/toproverif/AVATAR2ProVerif.java

src/main/java/graph/AUTGraph.java

src/main/java/myutil/CSVObject.java

src/main/java/proverifspec/ProVerifOutputAnalyzer.java

src/main/java/proverifspec/ProVerifResultTrace.java

src/main/java/tmltranslator/TMLRandomSequence.java

src/main/java/ui/GTURTLEModeling.java

src/main/java/ui/TGUIAction.java

...ractivesimulation/AvatarInteractiveSimulationActions.java

...i/interactivesimulation/InteractiveSimulationActions.java