The vCont handler used some overcomplicated logic, we only need to
iterate over the actions and apply them on the matching threads that
didn't match yet.

Thanks to DBG_REPLY_LATER we can now continue/step any thread regardless
of whether it is the one that raised the debug event. Just suspend all
active threads after debug event is raised and resume them one by one,
according to the gdb request. If the thread that raised the debug event
should not be resumed, reply with DBG_REPLY_LATER.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>