* Fix deadlock with preparse

* changed 2 strings to lower-case, which prevented compilation using UFS as FS under OSX. Thanks to Philip Edelbrock for reporting the issue.

* src/misc/image.c, include/vlc_image.h: new image handler facility making use of decoders and filters to load images.

playlist-item information.

* modules/codec/dirac.c: dirac decoder/encoder module based on libdirac (http://www.bbc.co.uk/rd/projects/dirac/index.shtml).

                     re-enabled OS X GL provider (QT output still default)

               not working in GL mode

* same options for node and items ATM
* some options still don't work

deletion (not intf-change)
modules/gui/wxwindows/*: clever item deletion using item-deleted

* delete everything related to groups from the item info panel
* some preparation work to reimplement the conextual menu

* implements deletion of playlist nodes
* fixes a bug in playItem:

* Each module can declare a "human-readable short name" with set_name
* Modules are sorted by category (set_category, set_subcategory).
  Modules configs can be separated by set_section()
* Separated audio-filter and audio-visual
* Separated extraintf and control
* New command and widget : add_module_list() for comma-separated modules
* Vfilters now use "," as separator