Enable role percentage allocation in templates

Enable us to assign percentages to role assignments in templates. Frequently, the hours are not distributed evenly across roles for a task. Ex: Proof R2 might be 15 min for a copywriter, 30 min for an art director and 1 hour for legal. Rather than build 3 tasks for Proof R2, it would be great to distribute percentages at the template level to efficiency. At a template level, it should be at the role level, not individual assignments, which is how it is built.