Fixes missing updates and state of menu check box

refs #8286

Till now, moving a skins2 slider was only possible if the pointer didn't get
too far away from the control (hardcoded parameter of 40 pixels in skins2).
Though this feature can also be seen elsewhere (firefox slider does it too),
the result may not look so natural especially for things like equalizers.
Moreover, qt4 doesn't implement this constraint, and therefore true skins2
sliders and qt4 sliders obtained from the popup menus were behaving differently.

So better remove this limitation and make things consistent throughout vlc
(skins2 + qt4)

Flowplayer javascript from static.flowplayer.org is not available
online anymore. Use new working link to point where javascript
can be found.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This broke depending on the locale (LC_COLLATE).
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

It is easy to see that the computation of the alpha constant is slightly
inefficient, as the root value can be close to 1 for the lower frequencies,
which would result in significant roundoff error if this value is subtracted
from 1.  In this patch, the computation of the alpha, beta, and gamma constants
has been simplified and refactored.
Acked-by: Ilkka Ollakka <ileoo@videolan.org>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Needs mooar testing

audiounit: run an AudioSession when outputting media content, so the user is able to listen to the audio when the silent switch is on

partially derived from the Mac vout code

This reverts commit d49e2ef6.

Many skins are buggy because the bitmap sizes or the resize policy
are inconsistent with button or checkbox constraints (fixed size)

This patch will help skin developers pinpoint which button or
checkbox is at fault. In addition, the resize policy will be
corrected (guessed from the lefttop parameter). This will enable
buggy and often unmaintained skins to work fine nevertheless.

partial revert of 9929cc94
Until we find a better solution. As discussed on ML.

This reverts commit 6265048a.