EXT-6655 Fixed Made the default busy message repsonse localizable with already existing account settings

- The root of busy response problem is that this text is located in non-localizable xml and, to make things worse, may be changed by user. So usual translation approach is little help here. So busy response was set the following way(EXT-5885)- on first run, string was written there from strings xml and was never changed later without direct user actions. So after changin locale message always remained the same.

- To make this string localize each time locale is changed and if it is the same as default message, new setting was added- BusyResponseChanged which is TRUE if user's busy message differ's from default. If it is true, we do nothing when locale changes, otherwise we set default message from current locale as user's busy message.

- Old transitional code from DEV-24146 was removed in this diff including unnecessary "BusyModeResponse2" setting(it is not needed because we'll anyway have to set busy message to default after first run of viewer after this fix and now busy response will be stored in "BusyModeResponse").

Warning! If user modified busy response message before this fix, it will be reset to default after first postfix run.

Reviewed by Richard Linden at https://codereview.productengine.com/secondlife/r/350/

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- Changed actions happening when minus or plus are held- now onSliderValueChanged() is not used for zoom via buttons. Zooming in and out now happens as it did
in 1.23 in LLJoystickCameraZoom::onHeldDown(), but only "Zoom in slow" and Zoom out slow" were borrowed from there, because fast versions are not needed- they do not happen in 1.23.

- Removed LLJoystickCameraZoom class, because it's not used anywhere. If need for it ever rises, it can be easily restored.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/530/

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Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/518/

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Problem description:
Minimal price value was 1.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/510/

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branch : product-engine

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EXT-6934 FIXED method LLInventoryObject::rename does not change Name, if string is empty after correction.

Problem description:
LLInventoryObject::rename corrects incoming string and remove odd spaces,
for example converts string "    " to empty string "",
as the result empty string can be set as InventoryObject name.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/505/

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branch : product-engine

Fix:
- Save the UUID of a newly created wearable to start editing it right after it gets worn.
  This approach replaces a temporary hack that invoked the editing panel whenever an item gets worn
  (if the Appearance SP is opened at the time).
  The hack only happened to work sometimes because the editing panel failed to open.

Other changes:
- Removed a check for inventory item completeness from LLAgentWearables::editWearable().
  because the check often fails and doesn't appear to be needed at all.
- Added warning messages to LLAgentWearables::editWearable() so that it's easier to debug.
- Replaced duplicated code in LLPanelOutfitEdit::onEditWearableClicked() with a call to gAgentWearables.editWearable().

Reviewed by Nyx at https://codereview.productengine.com/secondlife/r/529/

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EXT-7644 FIXED Implemented functionality for locking outfit modification controls and used it for 'save outfit' action.
1 Added functionality for locking outfit in LLAppearanceMgr. Outfit should be locked when outfit related operation is started(now it is used for updateBaseOutfit) and unlocked when operation completed or timeout is exceeded.
2 Added outfit saved and outfit lock changed signals to LLOutfitObserver.
3 Updated LLPanelOutfitsInventory and LLPanelOutfitEdit with functionality of controlling 'save outfit' controls state('save outfit' controls should be enabled only if outfit isn't locked and outfit is dirty).
4 Renamed action label of method LLPanelOutfitsInventory::isActionEnabled "make_outfit" to "save_outfit".

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branch : product-engine

EXT-7503 WIP Improved LLInventoryModel::updateItem to avoid an extra calls of notifyObservers while updating calling card item.

 - added check on whether avatar name exists in Name Cache before using its getter with callback (which raises notifyObservers).

Reviewed by Brad Payne at https://codereview.productengine.com/secondlife/r/526/

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branch : product-engine

reviewed by Mani

reviewed by erica

Fixed llinfos debug line to give more useful information.

Fixed an error in logic - low res textures should be identified by uploadNeeded versus uploadPending.
Also added a llinfos debugging line.

Backed out changeset e6feef9704cf to re-introduce Bao's fix

EXT-7443 FIXED Speak button's layout updated - Reduced right padding by 2 px in main locale, remove horizontal align in 'de' locale.

For now all locales have the same center aligning with right padding to ignore space under indicator.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/519/

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branch : product-engine

Upgrade Darwin libcurl to 7.20.1 and ares to 1.7.1

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/520

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This patch follows (23f0f13abc8b) and prevent to show two messages about empty Friends list.

Reviewed by Vadim Savchuk.

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reviewed by Richard Nelson at https://codereview.productengine.com/secondlife/r/516/

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EXT-7441 FIXED Improved condition to give up fetched inventory items in LLInventoryFetchItemsObserver

Reason: LLInventoryFetchItemsObserver is used to fetch necessary gesture items. Its logic was based on count of "inventory changed" events. In case of there was too many requests stored item UUIDSs are be removed from queue by mistake - notification can be triggered because some other item is renamed.

This issue can appear wherever LLInventoryFetchItemsObserver is used.

Fix: improved logic to make decision to give up fetching items.
 For now it bases on period while waiting items to arrive from server and a number of attempts to repeate waiting.
 This is a constants of the LLInventoryFetchItemsObserver (10 times by 10 seconds)

Tested with test case in JIRA (total count of inventory items - 13,888).

Most likely that was a reason of inventory loss (EXT-7503).

Reviewed by Brad Payne at https://codereview.productengine.com/secondlife/r/507/

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branch : product-engine

extended find wearables of type functor to filter out links

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/522

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branch : product-engine

reviewed by Nyx