Replaced duplicating code with generic function LLCommonUtils::computeDifference()

Reviewed by Vadim Savchuk - https://codereview.productengine.com/secondlife/r/313/

--HG--
branch : product-engine

Implemented EXT-6724(normal task) - Implement flat list view of filtered inventory for "add wearables" panel of outfit editor
1. Modified LLInventoryItemsList - implemented delayed item construction. Items are added during draw, not more than 50 items will be added in single draw. This lets us reduce system overload during multiple panel construction.
2. Implemented LLFilteredWearableListManager to populate inventory flat list with data. This class filters entire inventory according to specified filter and populates specified inventory list with data.
3. Created LLCommonUtil::computeDifference() to avoid code copy-pasting(will use it in all appropriate places in next review request)

Reviewed by Mike Antipov - https://codereview.productengine.com/secondlife/r/301/

--HG--
branch : product-engine

Implemented by SL EXT-6722(normal task) - Create modified inventory view for "my outfits" tab in top-level appearance sidebar (tier 1)

llui:
- Setting container panel for accordion tab control to dynamically add tabs to accordions.
- Added method to dynamically remove accordion tabs.
- Added LLIconCtrl image setter.

newview:
- Class LLOutfitsList - a list of agents's outfits from "My Outfits" inventory category which represents each outfit by an accordion tab with a list of items inside it.
- Class LLWearableItemsList - a list of wearable items used in each accordion tab of "My Outfits" tab.
- Class LLInventoryItemsList - a base class for LLWearableItemsList that represents inventory items by panels in LLFlatListView.
- Class LLPanelInventoryItem - inventory item representation for a flat list. Item icon is set according to item type.
- Class LLInventoryCategoriesObserver - an observer used in LLOutfitsList for monitoring changes to "My Outfits" inventory category and updating outfits accordion tabs and list of items for each outfit.

Known issues:
- Only first outfit tab is displayed in "My Outfits" until this tab is expanded.
- Bottom bar buttons and filter field not functioning for "My Outfits" tab since LLOutfitsList still doesn't support selection, filtering and sorting.
- "My Outfits" and "Wearing" tabs of "Appearance" side panel might need a common interface to use LLOutfitsList and LLinventoryPanel as tabs in LLPanelOutfitsInventory or "Wearing" tab should be replaces with LLOutfitsList class object i.e. a flat list.

On review - https://codereview.productengine.com/secondlife/r/285/

--HG--
branch : product-engine

fixed EXT-6848 Avoid creation of dummy objects in LLOnlineStatusToast and LLPanelGenericTip classes.
* decoupled tip toast panel related logic from class LLTast;
* moved documentation comment of  LLPanelGenericTip constructor from .cpp to .h file;
* corrected name attribute in panel_generic_tip.xml;

reviewed by Mike Antipov and Vadim Savchuk at https://codereview.productengine.com/secondlife/r/230/

--HG--
branch : product-engine

and doesn't fit on toast
* Unbolded startup toast message text;
* Avoided increasing complexity of LLToastNotifyPanel class that in future
should be decoupled on separate independent toast panel implementations and
added LLPanelGenericTip class to represent generic notifytip panels.

reviewed by Vadim Savchuk and Mike Antipov at
https://codereview.productengine.com/secondlife/r/214/

--HG--
branch : product-engine

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.