Enable Editing of Predecessors in Task View

[#1]

PROBLEM: User is unable to edit a predecessor on the task detail page.

CHALLENGE: Poor user experience for end-users (have to remove and re-add predecessors to update on this view)

BENEFIT: A fix would support users who prefer to see the dependancy type and lead/lag settings separated out.

SOLUTION: enable editing of predecessor fields or enable "dependancy type" and "Lag" as available fields.