Rename floor to level

...u/stups/codegenerator/generators/ExpressionGenerator.java

...hu/stups/codegenerator/generators/OperationGenerator.java

...es/de/hhu/stups/codegenerator/drone/DroneCommunicator.mch

...hu/stups/codegenerator/drone/DroneCommunicator_Mockup.mch

.../de/hhu/stups/codegenerator/drone/DroneMainController.mch

...ources/de/hhu/stups/codegenerator/liftbenchmarks/Lift.mch

...t/resources/de/hhu/stups/codegenerator/project10/Lift.mch

...st/resources/de/hhu/stups/codegenerator/project5/Lift.mch

...st/resources/de/hhu/stups/codegenerator/project6/Lift.mch

...t/resources/de/hhu/stups/codegenerator/project6/Lift2.mch

...st/resources/de/hhu/stups/codegenerator/project7/Lift.mch

...st/resources/de/hhu/stups/codegenerator/project8/Lift.mch

...st/resources/de/hhu/stups/codegenerator/project9/Lift.mch