[bulk] God rays / Light shafts / Sunbeam aliases

create implication sunbeam -> light_rays
create alias god_rays -> sunbeam (I think the other way could be even better, but I don't know if we want to touch existing tag).
create alias light_shaft -> sunbeam
create alias crepuscular_rays -> sunbeam

Link to request

Some of those are kind of, er, obscure, but done.