Allow this file to recognize the number of combined items when exchanging items（MuunExchange.xml）

Allows the number of combinations of type 255 to be recognized when exchanging items，Better be able to identify multiple groups，For example，to exchange a certain item needs 1000 gems，we have a few groups of 255 gems in the bag，you can directly exchange successfully

Now it has to be a single quantity to be identified，and it can only identify the contents of the main backpack，The main backpack can hold up to 64 items，You can't use too many items in exchange for one item，If you can identify combinations and multiple combinations，The exchange setup will be more convenient and perfect