Parts status on a service call as its own field and filter

Track the parts status of a service call in its own field, separate from the call status, and filter the service board on it (for example, all parts received and not yet scheduled).

Today Awaiting Parts, Parts Ordered and Parts Received are values of the single service call status, so a call cannot be both scheduled and waiting on parts. Vote and comment if you need to see parts progress without losing the call's own status.