Description of the new feature/enhancement

Terminal consumers have a need to provide their own handlers for clickable regions of text in the terminal. For example: In VS this could enable clicking on build errors and opening up a document to the line and column called out in the error.

Proposed technical implementation details (optional)

There needs to be two additions to the terminal in order to enable this:

• Consumers of the terminal must be able to provide a pattern that will identify regions of clickable text
• Consumers will provide a callback that is called with the clicked text as a parameter