Added inputPath as an environment option for markdown engine

[GeorgeNance]

Solves #1510

Adding the inputPath to the markdown renderer so markdown it can be referenced by plugins.

[GeorgeNance]

If this is not a valid approach, maybe I can suggest adding a global for the current file being rendered ?

[zachleat]

The change seems to break two tests:

[zachleat]

This is an automated message to let you know that this issue requires additional input from the original poster and for the health of the repository issue tracker the issue will be closed. This is to help alleviate issues hanging open waiting for a response from the original poster.

Do not let the issue’s closing deter you. After you’ve supplied the required information, the issue will be reopened. Thanks!