GitLab

* add helper methods to crate backup files with suffix
* add migration revert function to MigrationAssistant
* move migration logic from VadereConsole back to MigrationAssistant
* add Test for MigrationSubCommand

add useful processors for later processorTests to the OSM-Tests. Change old processors in TestSFM to the new format.

update the AttributeAgents values to the values in weidmann-1993 and seitz-2016c for all model test scenarios.

update migration assistent such that one can choose from based on which version a project should be reimigrated.

add migration incident to delete an element inside an array, improve the code of the Graph/Tree-class