Implement pause_on_error in base class

[oliwel]

Would it make sense to have the "pause_on_error" feature as a general "try / catch" in the Workflow class?

Intended Purpose: If the feature was activated by setting the "pause_on_error" parameter for the action class, all (?) errors that are caught inside "execute_action" will be transformed to pause/retry.

Reason: Especially when working with external resources via connectors it is very cumbersome to protect any call with an extra eval. Adding eval on the top level of a method will also cause extra overhead and code.