MAINT-6519 Contribution, adds feature to replace inventory links

doc/contributions.txt

indra/newview/CMakeLists.txt

indra/newview/app_settings/settings.xml

indra/newview/llfloaterlinkreplace.cpp

indra/newview/llfloaterlinkreplace.h

indra/newview/llinventorybridge.cpp

indra/newview/llinventorybridge.h

indra/newview/llinventoryfunctions.cpp

indra/newview/llpanelmaininventory.cpp

indra/newview/llviewerfloaterreg.cpp

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

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

...view/skins/default/xui/en/menu_inventory_gear_default.xml