Severity levels not defined amongst variables for export

[felix-caboff]

Is your feature request related to a problem? Please describe.
I am hoping this is only a small change that would make debugging report template issues easier. At the moment I can't think of a way to iterate over the severity levels which means in order to group the findings by severity level i need to explicitely have a "Critical" section, a "High" section and so on. There may be a way of doing this but I can't find it in the documentation and I can't think of a simple way of doing it within the existing data structure that is made available to the Jinja2 engine. If this data is made available it would mean I could just have one instance of the content output which would mean a significant reduction in debug time when making template changes.

Describe the solution you'd like
It would be ideal to have this data structure made available to the various different output functions such that the Jinja2 engine can iterate over it. As this data already exists in the back end, I am hopeful that it is an easy change.

Describe alternatives you've considered
The only alternative I can think of is really complex and involves string splitting etc which is less than ideal.