Shipping from both SO job Inventory and Regular Inventory

Previously, when an item created on a job is associated to a sales order we lock in a few areas of shipping where we can no longer use regular inventory. This adjustment allows for shipping to pull from both regular and job inventory when an item is not custom. We'll also give an indication that there's a job pending when shipping and warn if a user tries to ship from inventory when there's an incomplete job associated. 

Customized items will still need to be shipped from the associated job.

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