Add/Pull arrays as pick multivalues

[patrickp]

It would be nice to be able to pull normal arrays (not array of objects) into a pick multivalue. Same for setting.

Example
ARRAY=1
ARRAY<-1>=2
ARRAY<-1>=3
CALL WOBJ(OBJ,"SET.ARRAY","testarray",ARRAY,"",RERR)

Recommend looking to see if ARRAY starts with a { or a [. If it does not then look for @am and use that to build
[ "1", "2", "3" ] and add that.

Same on extract. Perhaps a new action such as GET.ARRAY.MV and return it as a multivalue.