Switch Item.template and MobLoot to CObjectTemplate

Item.template is now the cache template from CObjectTemplate.lookup
instead of the legacy DB ItemTemplate, so item.template.cacheTemplate.X
becomes item.template.X. MobLoot, LootManager, ItemManager.isTwoHanded/
isShield and CombatManager.getSwingAnimation take a CObjectTemplate.

No value changes: every getter already read the cache template through
the bridge, and the lookup resolves the same 7586 ids as
static_item_templates with the same item_type (offline parity p17.py,
0 differences).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/devcmd/cmds/InfoCmd.java

@@ -515,7 +515,7 @@ public class InfoCmd extends AbstractDevCmd {
                 output += StringUtils.addWS("Qty: "
                         + df.format(item.getNumOfItems()), 20);
                 output += "Charges: " + (byte) item.chargesRemaining
-                        + '/' + item.template.cacheTemplate.getItemInitialCharges();
+                        + '/' + item.template.getItemInitialCharges();
                 output += newline;
                 output += "Name: " + template.cacheTemplate.getItemBaseName();
                 output += newline;