Initial integration of the new installer and updater framework

indra/cmake/BuildPackagesInfo.cmake

indra/cmake/BuildVersion.cmake

indra/cmake/ViewerManager.cmake

indra/llfilesystem/lldir_win32.cpp

indra/newview/CMakeLists.txt

indra/newview/VIEWER_VERSION.txt

indra/newview/alsquirrelupdater.cpp

indra/newview/alsquirrelupdater.h

indra/newview/app_settings/cmd_line.xml

indra/newview/app_settings/settings_alchemy.xml

indra/newview/installers/windows/viewer.nuspec

indra/newview/llappviewer.cpp

indra/newview/llappviewerwin32.cpp

indra/newview/llversioninfo.cpp

indra/newview/llviewerbuildconfig.h.in

indra/newview/llvoicevivox.cpp

indra/newview/res/viewerRes.rc

indra/newview/skins/default/xui/en/notifications.xml

indra/newview/skins/default/xui/en/strings.xml

indra/newview/viewer_manifest.py