PATH-710: Removing the pathfinding basic floater and supporting class.

indra/newview/CMakeLists.txt

indra/newview/app_settings/commands.xml

indra/newview/llfloaterpathfindingbasic.cpp

indra/newview/llfloaterpathfindingbasic.h

indra/newview/llviewerfloaterreg.cpp

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

...ewview/skins/default/xui/en/floater_pathfinding_basic.xml

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

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