Additional adjustment types

[tibkiss]

Would be good to have something like AddLegAdjustment, CloseLegAdjustment on lines of MoveLegAdjustment

From Parmod S

[tibkiss]

RemoveLegAdjustment was added in 2.4.3.
AddLegAdjustment is tracked at #34.
Additionally, ChangeQtyAdjustment is also proposed and tracked here #35