[7087] Use signed type as expected for item material field. This also fix -1 value output for it.

Also disable Class/Subclass item_template check by dbc data for avoid unexpected log spam (dbc have some wrong values for this fields).

src/shared/Database/DBCfmt.cpp

@@ -51,7 +51,7 @@ const char GtOCTRegenHPfmt[]="f";
 //const char GtOCTRegenMPfmt[]="f";
 const char GtRegenHPPerSptfmt[]="f";
 const char GtRegenMPPerSptfmt[]="f";
-const char Itemfmt[]="niiiiiii";
+const char Itemfmt[]="nxxiiiii";
 //const char ItemDisplayTemplateEntryfmt[]="nxxxxxxxxxxixxxxxxxxxxx";
 //const char ItemCondExtCostsEntryfmt[]="xiii";
 const char ItemExtendedCostEntryfmt[]="niiiiiiiiiiiiix";