param_type is not NULL, then function returns list of objects.
Each object represents one of available attribute for specified param type.
name is attribute name and field
values is mapped list
of available params to list of value of this attribute for that param.
param_type is NULL, then function returns list with keys for
each param type and values are lists described above.
live or static arena object
Type of param. One of
List of attributes or named list of lists of attributes for each param type.
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