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EXT-3012 : Cleanup LLToolDragAndDrop

Now checking if folder contents have links before allowing object drop.
Did some superficial cleanup of lltooldraganddrop files.

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Fixed the behavior so that New Window brings up a new floater inventory window instead of doing nothing.

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The issue was that the widgets for this panel are not built solely
from XUI. There's code in LLPanelPlaces::changeInventory() that
creates the actual My Inventory and Teleport History panels. Adding
help_topic strings to the relevant XUI files for the LLLandmarksPanel
and LLTeleportHistoryPanel classes fixes this issue.

vivox 'Unknown' is the more-descriptive '(Not Connected)' now.
plus, we admit that our Qt version number is hard-coded right into the viewer instead of asking Qt.

new ?lang=<LANG> query parameter.

than hardcode it in llvoiceclient.cpp. Also rename the string from
"Unknown" to "Not connected", to better reflect the fact that we get
the Vivox version once voice is connected.

Review #48

This change kills two birds with one stone: every frame, we check to see if the media data is the same as the one we 'initialize' with. If it is, we disable OK and Cancel. Otherwise we enable them. This makes it very difficult to set empty media data, as well as fixing the "apply button doesn't grey out" bug.

Eyes weren't alpha masked.
Hair wasn't being consistently alpha masked
Hair alpha mask was being ignored during avatar customization
We weren't hitting onFirstTEMessageReceived()

All of these were fixed. Also takes care of EXT-2926 EXT-2925 EXT-2974

Code reviewed by Bigpapi

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Includes removal of unused header files.
Includes changing big static map into a lldictionary.

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Changed local compositing code for alpha masks to handle the case where
we are generating a local composite of an alpha masked body part.
See JIRA for repro information

Code reviewed by Bigpapi

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CMakeFiles.txt file. Previously it checked for a narrow range of gcc
versions via a regex:

      if (${CXX_VERSION} MATCHES "4.[23]")

Now we explicit check for any version >= 4.2:

      if (${CXX_VERSION_NUMBER} GREATER 419)

chiclet”

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the floater version turned out easier to get on-spec (though not perfect).

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Observer wasn't being removed when class was deleted.

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Replaced LLNotifications::add call by LLNotificationsUtil::add.

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Work on major sub-task EXT-2790 (Complete Voice Control Panel (floater) started by Lynx (LLVoiceControlPanel))
 -- initialized agent icon, name
 -- added agent's speaker indicator

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avoided IM-toast popup when adding message to session;

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