macosx: video effects panel: synchronize text field and stepper values properly by using cocoa bindings

This simplifies the code and fixes stepper responseness.
This also fixes enabled state of some steppers.

For indentation, the outline table column needs to be set, which used to be the title column. This is not a bad choice, since it is only column populated by all items.

However, one can't remove the outline table column easily, so I chose to disable the ability to remove it, something virtually all users don't want to do anyway.

The option is presented to the user in a simplified way, since there is only one hardware acceleration module on the Mac.

close #7873

(first window as wallpaper, all other ones as normal windows.)

Also, omit fraction of seconds.

Fixes #7776

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Fix #7884 and #7887 by implementing the first proposition.

thanks to David for the feedback

Clone and wall is not supported yet.

bug was triggered only when using controls provided by the OS like NSWindow's fullscreen button

We only considered the audio already buffered through opensles engine,
so the calculation was incorrect.

Use samples rather than bytes for calculation, and a function rather than
hardcoding 2*2 all over the place when a size in bytes is needed.