[WMS][12.0] Add stock_move_location_dest_constraint_empty - alpha version

[grindtildeath]

This module implements destination location constraint on stock move line.

When installed stock moves will only be allowed if the destination location is
empty.

Related to #691

Requires:

• [WMS][12.0] Add stock_move_location_dest_constraint_base - alpha version #696

[jgrandguillaume]

Hi @grindtildeath ,

A remark here that I probably still have to dig a bit.

Probably the empty bin is something that we want to configure on locations, it's probably not a default for everywhere.
e.g. for handover place, it's not optimal to forbid an internal move if a move is already planned, because probably the bin will be empty by the time the next move will get there...

We should be able to define the "Empty bin" in the location hierarchy tree at a certain level and it should be true for all the children. Let's add a checkbox in location "Moves allowed only in empty bin" with a tooltip: "Check this box to forbid to move (or put away) goods in a location that is not empty or for which a move is already planned".