Improve Exception Handling for Inventory Plugin

Current Situation

• The Inventory Plugin reacts on SOSHibernateException to start processing of backlogged events.
• Other exceptions are simply passed to or logged by a calling class or method.

Desired Behavior

• The Inventory Plugin should only react on SOSHibernateInvalidSessionException to start processing of backlogged events.
• Other SOSHibernate Exceptions should not trigger the backlog processing but should be passed.
• All other exceptions should be wrapped to unique SOSInventoryExceptions before they are passed to or logged by a calling class or method.