Added Withdraw-X to BoB and Prifddinas bank chest.

-Support for the new bankscreen withdrawal method "Withdraw-X to BoB" 
-Bankscreen.withdraw and overloaded functions now contain a boolean (default false) for withdrawing-x normally versus withdrawing-x to the beast of burden familiar.
-Added BANK_CHEST_PRIFDDINAS
-Edited range in line 2074 with new bank chest accordingly 
-Fixed typo "optn" -> "open"
-Added/updated corresponding comments/documentation