Mark found items as warnings in Problems view

[blackwind]

I'd like to see an option to mark found items as warnings in the Problems view (Ctrl+Shift+M) so items can quickly be navigated between via F8 and Shift+F8. The user should be able to toggle this on or off per keyword via configuration, and perhaps choose to make them errors or infos instead of warnings.

[blackwind]

Upon further reflection, I'd like to request that they be marked as infos by default instead of warnings.

[blackwind]

The above commit is a start, but doesn't really address my concern. I'd still love an option to add these to the Problems view.