Evaluate constraints at runtime

[djones0]

Workstep constraints should be evaluated at runtime to determine what action should be taken on a WorkstepInstance.

There are two methods of WorkstepInstance constraints: Execution and Finality. A Workstep with an execution constraint should execute a WorkstepInstance only if the condition defined in the constraint are met. A Workstep with a finality constraint should first execute the WorkstepInstance, regardless of the defined constraint, then finalize the WorkstepInstance only if the conditions defined in the constraint are met.

[djones0]

@adunne09 @kthomas are constraints being evaluated at runtime now?