Make parser errors more user friendly

[Chris2011]

It would be good to have user friendly errors instead of Token errors with no meaning for the users. We already have 2, we can add more maybe.

[javierllorente]

Are you referring to the ones found in ExceptionUtils.handleAndDisplayProcessingException()?

[Chris2011]

No no, this is a subticket of the new UI switch and editor implementation. So it is about the parser errors.

[Chris2011]

I changed the title. Thx. :)