Initial merchant outbox button

indra/newview/CMakeLists.txt

indra/newview/app_settings/commands.xml

indra/newview/llfloateroutbox.cpp

indra/newview/llfloateroutbox.h

indra/newview/llviewerfloaterreg.cpp

indra/newview/skins/default/textures/textures.xml

...a/newview/skins/default/textures/toolbar_icons/outbox.png

.../newview/skins/default/xui/en/floater_merchant_outbox.xml

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

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