Split groups off into their own floaters

indra/newview/CMakeLists.txt

indra/newview/app_settings/settings_alchemy.xml

indra/newview/llfloatergroupprofile.cpp

indra/newview/llfloatergroupprofile.h

indra/newview/llgroupactions.cpp

indra/newview/llgroupactions.h

indra/newview/llnotificationgrouphandler.cpp

indra/newview/llpanelgroup.cpp

indra/newview/llpanelgroupcreate.cpp

indra/newview/llviewerfloaterreg.cpp

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