Add options to disable point at beam and spiral effects

indra/newview/app_settings/settings_alchemy.xml

indra/newview/llagentcamera.cpp

indra/newview/llappviewer.cpp

indra/newview/llgiveinventory.cpp

indra/newview/llselectmgr.cpp

indra/newview/llstartup.cpp

indra/newview/lltooldraganddrop.cpp

indra/newview/lltoolpie.cpp

indra/newview/lltoolplacer.cpp

indra/newview/lltoolselect.cpp

indra/newview/llviewermenu.cpp

indra/newview/llviewermessage.cpp

indra/newview/llvoavatarself.cpp