for lss-mode, list of constants, functions and events taken from
https://bitbucket.org/oz_linden/storm-1831/raw/2748e32b8d4827dcb5822129b33e4a730a1a2ce0/indra/newview/app_settings/keywords_lsl_default.xml

This should be pretty complete now.  See
https://jira.secondlife.com/browse/STORM-1831? .