Allow for custom hyperlinks for matched patterns

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: macOS 10.15
• Hyper.app version: 3.0.2
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/4e4b1f6a93bd6ee16694d17ed80826c8
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere):
• The issue is reproducible in vanilla Hyper.app: Is Vanilla

Issue

I'd like to be able to make arbitrary patterns hyperlinkable. Consider the old plugin, which seems to have recognized e-mail addressed and made them hyperlinkable. I'd like to do something similar with other patterns, such as with Python's bpo-NNNN (which would link to bugs.python.org/issues/NNNN).

I'd like to be able to achieve this while relying on the code within Hyper.js to render the links and handle the click events. Ideally, Hyper.js would offer a configuration parameter mapping regexes to their hyperlinks and allowing groups from the regexes to be specified in the resultant hyperlink. Extra credit if the rendering could also be a javascript function accepting the match object and returning the hyperlink.

Start by reading Hyper.js's existing matched-pattern hyperlink rendering and click handling, then compare it with the linked hyperlinks plugin. Define how configuration maps regex matches to URLs, including capture groups and the optional match-object function. Done means arbitrary patterns such as Python bpo-NNNN can render as clickable links; the issue names no files or tests.