EXT-3024 : Broken links don't show up in inventory

Mocked up some link icons for broken links.  These need to be polished up.
Broken links now have an IT_ (instead of being IT_NONE) so that they're filtered correctly and thus can show up in inventory.

--HG--
branch : avatar-pipeline

(script editor scrolls upward while typing)
Backed out changeset: e38642e0c21c

Document rect left edge was being computed incorrectly.
Made floater_test_textbox.xml have more examples of text.
Reviewed with Kelly

Discovered bug: active drop-down missing art. Fixed in textures.xml.
http://jira.secondlife.com/browse/EXT-2674

--HG--
branch : avatar-pipeline

--HG--
branch : avatar-pipeline

EXT-3012 : Cleanup LLToolDragAndDrop

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

--HG--
branch : avatar-pipeline

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

--HG--
branch : avatar-pipeline

http://jira.secondlife.com/browse/EXT-2906

--HG--
branch : avatar-pipeline

http://jira.secondlife.com/browse/EXT-1621
http://jira.secondlife.com/browse/EXT-1669
http://jira.secondlife.com/browse/EXT-1671

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.

arrow_up and arrow_down were removed from textures at some point. I put them back so that the arrows in panel_preferences_alerts look right.

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

--HG--
branch : avatar-pipeline

http://jira.secondlife.com/browse/EXT-2970

http://jira.secondlife.com/browse/EXT-2812