there is a conflicting migration in 2-1-stable branche (8de75a5d3d519c5498843edda983702852caaade)
it's order_id ofcourse!
Make Stock::Package more aware of units structure

`add` and `find_item` now might receive a variant and a line item for
cases where they both don't refer to the same product
Grab shipment line items via inventory units

The previous implementations doesn't make sense anymore on the current
split shipments scenario. Can't see a reason why tracking inventory
levels config should influence whether or not the line item should be
returned
Load line items in shipment `manifest`

We still need to figure out a way to lazy load inventory units variant
and line items removing the default scope from Variant
Add inverse_of to product variant associations

Fixes #4031
added autocomplete off HTML5 tag to mail method settings for username and password

Fixes #4036
stock_movements helper fix for stock_transfer

Fixes #4037