Bug 22996: Move barcode separators to a preference

Bug 22996: Move barcode separators to a preference

This patch makes batchMod.pl and inventory.pl pick the barcode
separators from a new pref BarcodeSeparators (instead of hardcoding
these separators differently).
A few other code locations may be potential candidates for such a change
too.

Test plan:
Test inventory with a few variations of BarcodeSeparators.
Test Batch item modification similarly.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>