Locations reported should include end position

[anderseknert]

Regal currently inherits location reporting from OPA, which only provides the start location of the AST node. Regal should extend this in it's output reports to try and always include an end location as well, as that provides a better experience in UI's like editors. If this is difficult to calculate, we'll just settle for end of line. For most violations though, I think this should be fairly trivial. It's still a lot of work though, as we'll need to do this for all the rules in Regal, and update the report formats accordingly.

[anderseknert]

Here's a good example of a rule that would greatly benefit from this: