SL-6109 Mouse support ready

indra/llcommon/indra_constants.h

indra/llcommon/llkeybind.cpp

indra/llcommon/llkeybind.h

indra/llui/llscrolllistcell.cpp

indra/newview/llagent.cpp

indra/newview/llagent.h

indra/newview/llappviewer.cpp

indra/newview/llfloaterpreference.cpp

indra/newview/llfloaterpreference.h

indra/newview/llkeyconflict.cpp

indra/newview/llkeyconflict.h

indra/newview/llviewerkeyboard.cpp

indra/newview/llviewerkeyboard.h

indra/newview/llviewerwindow.cpp

indra/newview/llviewerwindow.h

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

...wview/skins/default/xui/en/panel_preferences_controls.xml