Port in Catznip's Asset Recovery system to prevent lost scripts and notecards on crash

indra/llui/lltexteditor.cpp

indra/llui/lltexteditor.h

indra/newview/CMakeLists.txt

indra/newview/llappviewer.cpp

indra/newview/llfloaterassetrecovery.cpp

indra/newview/llfloaterassetrecovery.h

indra/newview/llpreview.cpp

indra/newview/llpreview.h

indra/newview/llpreviewnotecard.cpp

indra/newview/llpreviewnotecard.h

indra/newview/llpreviewscript.cpp

indra/newview/llpreviewscript.h

indra/newview/llviewerassetupload.cpp

indra/newview/llviewerassetupload.h

indra/newview/llviewerfloaterreg.cpp

indra/newview/llviewerinventory.cpp

indra/newview/llviewerinventory.h

...a/newview/skins/default/xui/en/floater_asset_recovery.xml