Removed all references to CivUp/GEM or VEM

All "UPDATE LoadedFile SET Value=1 WHERE Type= " commands now point to
the correct files.
I toyed with the idea of renaming the TEXT\en_US\*.sql files to the
"CEP_*******" format but chose the easier option of changing the UPDATE
commands.

CEP_AI_Events.lua still has the "include("CiVUP_Core.lua")" line which
points to a nonexisting file.