Revert "Added input and outputvariables for multiple elements"

.../src-gen/de/sample/onlineschuhdemo/BusinessRuleTasks.java

...neSchuhDemo/src-gen/de/sample/onlineschuhdemo/Events.java

...e/sample/onlineschuhdemo/ExternalServiceMockProvider.java

...SchuhDemo/src-gen/de/sample/onlineschuhdemo/Gateways.java

...uhDemo/src-gen/de/sample/onlineschuhdemo/ManualTasks.java

.../de/sample/onlineschuhdemo/MatchingTestcollectionOld.java

...hDemo/src-gen/de/sample/onlineschuhdemo/ServiceTasks.java

...src-gen/de/sample/onlineschuhdemo/Testcollection-old.java

...emo/src-gen/de/sample/onlineschuhdemo/Testcollection.java

...chuhDemo/src-gen/de/sample/onlineschuhdemo/UserTasks.java

.../masterthesis/Testgenerator/bpmn/data/BPMNFormFields.java

...asterthesis/Testgenerator/migration/MigrationService.java

...thesis/Testgenerator/rest/dto/FlowElementEnhancedDTO.java

...erthesis/Testgenerator/rest/service/test/TestService.java

...ster/masterthesis/Testgenerator/utils/BPMNParseUtils.java