PATH-711: Implementing Leo's changes for the pathfinding console.

indra/newview/llfloaterpathfindingconsole.cpp

indra/newview/llfloaterpathfindingconsole.h

indra/newview/llpathfindingcharacterlist.cpp

indra/newview/llpathfindingmanager.cpp

indra/newview/llpathfindingmanager.h

indra/newview/llpathfindingnavmeshzone.h

indra/newview/llpathfindingpathtool.cpp

indra/newview/llstartup.cpp

indra/newview/llviewermenu.cpp

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

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