Added a simple ui for displaying experiences keys with hardcoded contents.

indra/newview/CMakeLists.txt

indra/newview/llfloaterexperiences.cpp

indra/newview/llfloaterexperiences.h

indra/newview/llpanelexperiences.cpp

indra/newview/llpanelexperiences.h

indra/newview/llviewerfloaterreg.cpp

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

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

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

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