add material count to inventory item (?????)

src/character/character.rs

@@ -232,7 +232,8 @@ impl SelectScreenCharacter {
 #[derive(PSOPacketData, Default, Copy, Clone)]
 pub struct InventoryItem {
     pub equipped: u16,
-    pub tech: u16,
+    pub tech: u8,
+    pub material_count: u8, // in items 8 - 13 material usage values are stored here
     pub flags: u32,
     pub data1: [u8; 12],
     pub item_id: u32,