21601: Add multi-select capability to lists.

Implemented on project worksheets, and issue to shipping re factored to take advantage as well.
Moved XV.TransactionList to enyo-x
Moved most processing on XV.IssueToShipping down to XV.IssueToShippingList to leverage multi-select and also so we can embed this list elsewhere like on Sales Order.
Removed transaction functions (save and doReturn) from XM.IssueToShipping since these are performed exclusively by the class methods now from the list.