Add Reset Mechanism

In OpenPASS we want to reuse the OSE for multiple invocations. Currently for every new invocation the OSE is deleted and a new OSE instance constructed, although some things are unchanged. In particular the scenario file has to be read only once and the static part of the environment only needs to be created once. Therefore we want to introduce a reset mechanism in the OSE that allows to restart the scenario while reusing existing data where possible.