MEDIUM: listeners: support the definition of thread groups on bind lines

This extends the "thread" statement of bind lines to support an optional
thread group number. When unspecified (0) it's an absolute thread range,
and when specified it's one relative to the thread group. Masks are still
used so no more than 64 threads may be specified at once, and a single
group is possible. The directive is not used for now.
3 files changed