video: remove another redundant wakeup

The wakeup at the end of VO frame rendering seems redundant, because
after rendering almost no state changes. The player core can queue a new
frame once frame rendering begins, and there's a separate wakeup for
this. The only thing that actually changes is in->rendering. The only
thing that seems to depend on it and can trigger a wakeup is the
vo_still_displaying() function. Change it so that it needs an explicit
call to a new API function, so we can avoid wakeups in the common case.

The vo_still_displaying() code is mostly just moved around due to
locking and for avoiding forward declarations.

Also a somewhat risky change (tasty new bugs).

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