macosx: fixed conditionals for the different OS X release by adapting to the newly updated version defines

Pointed-out-by: Michał Trzebiatowski <hippie_1968@hotmail.com>

Signed-off-by: Christoph Miebach <christoph.miebach@web.de>

Found by the GTM Xcode plugin, which was finally updated for Xcode4

no functional changes

Change the string's text field from static to editable, so options not in the
wizard can be added. Uses the string from this field directly, rather than the
stored string.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

No functional changes. Some more can't be replaced yet, as we still support 10.5

macosx: fixed corner case which could lead to incorrect information about selected codecs, removed the misleading AVI UI element and fixed another bug which could lead to incorrect codec selection (#3708)

legacy OSX interface: fixed transcoding with the wizard and re-added mp4a as valid audio codec to the sout panel

pl_Hold() assumed the playlist was already created.
pl_Release() does not solve any problem. Playlist synchronization is
done with the playlist lock, while playlist deletion must anyway be done
after all interfaces, services and other threads are joined.

Currently only used to display the question, login, error and critical core dialogs whenever VLC runs with a GUI on a Mac.

Disabled by default. The login dialog's layout will need some more love.

macosx: get rid of the infamous 'get' prefixes everywhere and finally respect Cocoa's naming scheme here

 This will force people to use VLC_INPUT_OPTION_TRUSTED flag when they
need it and ease security review.
 This commit has no functionnal/security changes.

additionally, the wizard now remembers the last selected encap format correctly

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