nx2 services: callbacks no longer outlive their sessions

Under cdb title 1 reported "Free Heap block modified after it was freed"
when it recreated its display session (~4 min in); a run without the
debugger crashed at 113 s. The vi2 vsync timer callback (HostTiming thread)
captured the session and signalled its events; the destructor unscheduled
the timer (which does not wait for a running callback) and closed the
events. The syncpt slot actions (GPU thread) had the same race with
CloseEvent, as did the frame-capture and dump callbacks.

vsync events now live in state shared with the callback and are emptied
under its lock before closing; syncpt actions check a shared "alive" flag
under a mutex the destructor takes; capture/dump callbacks hold no session
pointers.

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