Purpose of this class is to enable custom XML issue views.
This class is a wrapper of
If field parameters for issue view were defined correctly they are evaluated first
and only for requested fields visibiliy is checked with
For non orderable fields checking with
FieldVisibilityManager is skipped and true value is returned.
Another exception are time tracking fields, which are evaluated based on
- true if field is defiend in custom view parameters and not hidden,
or just not hidden if no view parameters were specified
or is non orderable field