Cleaned up item flags: separated item proto flags and item field flags

Implemented use of:
ITEM_PROTO_FLAG_PROSPECTABLE and ITEM_PROTO_FLAG_MILLABLE now checked instead of bag family mask
ITEM_PROTO_FLAG_SMART_LOOT for profession recipes, player has to have skillline and not know the recipe
ITEM_PROTO_FLAG_OPENABLE item has to have it set to use item_loot_template
ITEM_PROTO_FLAG_NOT_USEABLE_IN_ARENA if this is set item can never be used in arena
ITEM_FLAG_UNLOCKED marks unlocked items

Simplified BoA check for mail sending
Stackable items are no longer refundable
Removed useless code that always set ITEM_FIELD_FLAGS equal to proto flags
Unlocking items (lockpicking) is now blizzlike

--HG--
branch : trunk

src/server/game/Entities/Item/Container/Bag.cpp

@@ -87,7 +87,6 @@ bool Bag::Create(uint32 guidlow, uint32 itemid, Player const* owner)
 
     SetUInt32Value(ITEM_FIELD_MAXDURABILITY, itemProto->MaxDurability);
     SetUInt32Value(ITEM_FIELD_DURABILITY, itemProto->MaxDurability);
-    SetUInt32Value(ITEM_FIELD_FLAGS, itemProto->Flags & 0xFFFFFFF7);    // TEMP HACK, DONT REMOVE - Shauren
     SetUInt32Value(ITEM_FIELD_STACK_COUNT, 1);
 
     // Setting the number of Slots the Container has