use game implementation for stack item limits

src/RareItemSet.hh

@@ -10,6 +10,10 @@ struct RareItemDrop {
 } __attribute__((packed));
 
 struct RareItemSet {
+  // TODO: It looks like this structure can actually vary. We see the offsets
+  // 0194 and 01B2 in the unused section, along with the value 1E (number of box
+  // rares). In PSOGC, these all appear to be the same size/format, but that's
+  // probably not strictly required to be the case.
   // 0x280 in size; describes one difficulty, section ID, and episode
   RareItemDrop rares[0x65];     // 0000 - 0194 in file
   uint8_t box_areas[0x1E];      // 0194 - 01B2 in file