Expand on task lists. Add task association to issues.

Add new "task" object or similar customizable/generic object under issues.

Add a structured way to handle "tasks" under issues. Something more than the adhoc free-form text method we have today.

Fundamentally, there is a structural relationship between "tasks" and an "issue" / "user story"

Tasks are an aspect of an Issue no less important than a description, title, etc.