Refactored Junk Dealer script, Selling junk items will now place "buy back" device in datapad

Moved the SUI Windows into Java so no need for global variables, updated
conversation messages for the changes to ProsePackage, added the "buy
back" control device - this contains the latest 10 items you sold to the
junk dealer.

src/resources/objects/creature/CreatureObject.java

@@ -278,6 +278,15 @@ public class CreatureObject extends TangibleObject implements Serializable {
 		}
 	}
 
+	public void deductCashCredits(int amountToDeduct) {
+		synchronized(objectMutex) {
+			this.cashCredits -= amountToDeduct;
+		}
+		if(getClient() != null && getClient().getSession() != null) {
+			getClient().getSession().write(messageBuilder.buildCashCreditsDelta(cashCredits));
+		}
+	}
+	
 	public void setCashCredits(int cashCredits) {
 		synchronized(objectMutex) {
 			this.cashCredits = cashCredits;
@@ -1805,5 +1814,4 @@ public class CreatureObject extends TangibleObject implements Serializable {
 			}
 		}
 	}
-	
 }