Re-implementing the path testing functionality as a proper LLTool.

indra/llcommon/llcursortypes.cpp

indra/llcommon/llcursortypes.h

indra/llwindow/llwindowwin32.cpp

indra/newview/CMakeLists.txt

indra/newview/llfloaterpathfindingconsole.cpp

indra/newview/llfloaterpathfindingconsole.h

indra/newview/llpathfindingpathtool.cpp

indra/newview/llpathfindingpathtool.h

indra/newview/lltoolmgr.cpp

indra/newview/lltoolmgr.h

indra/newview/llviewerwindow.cpp

indra/newview/pipeline.cpp

indra/newview/res/lltoolpathfinding.cur

indra/newview/res/viewerRes.rc

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