Remove needsBoundary in AttributesSimulation?

Remove needsBoundary in AttributesSimulation it seems to be unused. Note that to delete it one has to change the migration process such that old json files can be migrated. If one removes needsBoundary in AttributesSimulation the next start of the vadere with an old project will cause an exception.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information