vadere-console.jar shall use more than two exit codes

At the moment, vadere-console.jar only returns two exit codes (0 for success, 1 otherwise).

Especially for the CI environment, it would be useful to have multiple return values so that caller of vadere-console.jar is better informed.

Possible exit codes:

• 0 = success
• 1 = exception occurred
• 2 = assertion occurred (raised by a test processor)

Before implementing, think about useful exit codes.