Create custom exceptions instead of relying on RuntimeException

[hanneskod]

Let's be more informative in general. For example

UnableToBuildDonorException extends \LogicException
{
}

Work through src...

And when exceptions are caught in CommanWrapper differentiate between

• giroapp exceptions: presented and logged as a normal ErrorEvent (not as an Exception). A good way to present errors when dispatcher is not available.
• other exceptions: a more severe state. Logg as an Exception (as is done today). Present a "this should not happen, please submit an issue" message..

[hanneskod]

Also let giroapp exceptions carry an error code to be written to the event context in ErrorEvent.

Can be used to set the return code of the application.

Good for scripting. And really good for the feature tests, as expected errors can be validated..

[hanneskod]

How often do we dispatch error or warning events and expect execution to continue (and want an error return code)? Related to the need to keep return status listener..