Bug 22740: Automatically change lost status when item is paid for

Bug 22740: Automatically change lost status when item is paid for

This patch implements two new system preferences, "UpdateItemLostStatusWhenWriteOff" and "UpdateItemLostStatusWhenPaid" that allow you to specify the status to change an item to when the outstanding balance of a lost item is paid or written off. These preferences are tied to the LOST authorised values set.

Test Plan:
 - Set one of the system preference to any of the available values
 - Set an item as lost
 - Make a manual invoice for your desired user and assign it to the barcode of the above item
 - Save and Pay
 - Select Pay/Write Off depending on the system preference you selected above
 - Pay
 - Note that the status of the item has changed to the status you set with the system preference
 - Repeat for all values of both system preferences
 - Check that when the system preference is left blank and no option is chosen, the lost status does not update.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Laura Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>