Add an IsContainerRangeFixed() hook which specifies whether or not
the container in question can only display elements within a fixed
lower/upper bound, i.e. B{Object}List.
- Since we currently limit the maximum number of child elements we'll
show, it's helpful information to know the actual capacity of the list
in case it contains more, especially when we later support requesting
additional elements to be retrieved.
- When a debugging libbe is present, and a BList is encountered,
we now read its internal structure and expose it as if it were an
array of pointers. Combined with typecasting, this means one can
now easily inspect the content of such a list.
