macosx: decouple !video-deco from detached video window and allow changing this setting without restart

Close #750

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

create as many presets as you want based upon the respective current selection and remove any (including the defaults), if you don't like them. Reset VLC's preferences to get the original set back. There is no way to edit existing presets and this isn't scheduled for now.

This was only useful when we had several URLs to handle

macosx: use structures in NSUserDefaults to manage the EQ presets to prepare the implementation of custom EQ sets

Initially, the presets are fetched from the audio filter. After the import, only the NSUserDefaults structures will be used.

Signed-off-by: François Revol <revol@free.fr>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Check which codecs are available instead of asking blindly for h264.
Signed-off-by: François Revol <revol@free.fr>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

CAS: use the generic dialogs to fetch a text input from the user or to let him/her choose an item in a popup

The moogaloop flash urls are not valid anymore
Use the html5 API instead, which gives mp4 files.
Signed-off-by: Mirsal Ennaime <mirsal@videolan.org>

As far as I can tell, this isn't used anywhere anymore

This allows us to use a more recent version and to drop the dependency
of glib (and python) which allows a better bootstrap on limited systems