[Bug Fix] Disallow multiple augments in same item. (#1916)

- Disallows multiple augments via #augmentitem or otherwise.
- Added ItemInstance::ContainsAugmentByID(item_id) helper method for finding an augment in an item instance.

common/item_instance.cpp

@@ -689,6 +689,25 @@ bool EQ::ItemInstance::IsAugmented()
 	return false;
 }
 
+bool EQ::ItemInstance::ContainsAugmentByID(uint32 item_id)
+{
+	if (!m_item || !m_item->IsClassCommon()) {
+		return false;
+	}
+
+	if (!item_id) {
+		return false;
+	}
+	
+	for (uint8 augment_slot = invaug::SOCKET_BEGIN; augment_slot <= invaug::SOCKET_END; ++augment_slot) {
+		if (GetAugmentItemID(augment_slot) == item_id) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
 // Has attack/delay?
 bool EQ::ItemInstance::IsWeapon() const
 {
@@ -1706,4 +1725,4 @@ EvolveInfo::EvolveInfo(uint32 first, uint8 max, bool allkills, uint32 L2, uint32
 
 EvolveInfo::~EvolveInfo() {
 
-}
+}