EXT-8577 WIP Context menu items for multi-attachments.

Done:
- 1. Dropped the obsolete "MultipleAttachments" setting.
- 2. Added an "Add" item to the following attachment-related context menus:
     * My Appearance (ex-My Outfits) context menu.
     * Edit Outfit -> Add More context menu.
     * Object in-world context menu.
     * Inventory context menu.
     * Object inspector gear menu.
- 3. Modified "Attach To / Attach To HUD" to perform the "add" instead of "replace" action.

TODO:
- Ability to attach multiple objects at once from the Add More panel (bulk attach).
- Make sure there's no memleak when you click Wear/Attach in the in-world object context menu
  and the callback isn't invoked (because e.g. avatar fails to get close enough to the object).

Issues:

0. I'm not sure whether LLAgentWearables::userAttachMultipleAttachments()
   should replace attachments or add them. Assumed the former.

1. I couldn't verify that adding objects from the object inspector menu works
   because I either could wear an object or see its inspector, not both.

2. > 1. Right-click on an object in your inventory and select "Wear".
   > VERIFY: Attaches the object and replaces whatever's there; asks for
   > confirmation before replacing an existing object.
   I think this is impossible to implement because we don't know in advance
   what point the object will be attached to, so we can't display a confirmation dialog.

Reviewed by Seraph at https://codereview.productengine.com/secondlife/r/843/

--HG--
branch : product-engine

1 files changed, 1 insertions, 1 deletions

diff --git a/indra/newview/llappearancemgr.cpp b/indra/newview/llappearancemgr.cpp
index 296a580106..cecb2ee6ad 100644
--- a/indra/newview/llappearancemgr.cpp
+++ b/indra/newview/llappearancemgr.cpp
@@ -1012,7 +1012,7 @@ bool LLAppearanceMgr::wearItemOnAvatar(const LLUUID& item_id_to_wear, bool do_up
 		addCOFItemLink(item_to_wear, do_update, cb);
 		break;
 	case LLAssetType::AT_OBJECT:
-		rez_attachment(item_to_wear, NULL);
+		rez_attachment(item_to_wear, NULL, replace);
 		break;
 	default: return false;;
 	}