support for <path>:<line>:<column>

[testforstephen]

Originally created by @clankill3r at https://github.com/redhat-developer/vscode-java/issues/1025

It would be really great if :: was supported from using System.out.println. If it already is, then please provide a working example, cause I can't get it to work.

Just like we have clickable links now when having an exception:

I would like to be able to make those links as well.