Bug report credited to Matthew Hodgson

* modules/codec/libmpeg2.c: use sequence->picture_width insted of display_width since display_width is used to convey the pan&scan info.

* ALL: changed VOUT_SET_ZOOM into VOUT_SET_SIZE and implemented a VOUT_GET_SIZE for some of the vouts.

  It can be defined in the XML with usual sliders, using the new
  variables equalizer.band(0), ..., equalizer.band(9)
  (0% means -20dB, and 100% means +20 dB).
  More things to come, but it is already working as is.
* all: AsyncQueue::push() now does also a remove() by default, as
  the two methods are always called together

* extras/contrib/src/Makefile, extras/contrib/src/Patches/libmpcdec.patch: patch for libmpcdec on win32.

* extras/contrib/src/Makefile: disable asm in FLAC on win32 since its build system insists on creating elf objects (would need fixing).

aka : merge the big wx changes from branch

* modules/gui/wxwidgets/playlist.cpp: don't call treectrl->EnsureVisible() when updating a playlist item. That just makes navigation of the playlist unusable.

    - faad2, goom2k4, libpng, ffmpeg (modified gibalou's patch and moved it to a win32-file)

* modules/gui/wxwidgets/playlist.cpp: if too many items are queued to be added to the playlist then it is quicker to just rebuild the whole playlist instead of inserting items one by one (fixes huge slowdown when using shoutcast).