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It reduces the number of executed vlc_object_find.
Some macosx calls have been commented out.

It also improves reactivity of seek while paused.

Reported by ivoire.

No functionnal changes.

As a side effects, it may improve a bit frame stepping.

They are copies of vout->fmt_*.

This removes support for non converted "video output" and "video filter"
modules.

It only works for vout display modules.

Attach the vout object to parent before spu creation so modules loaded by spu can use var inheritance.