Add hide/show vlm helper button. Original idea by Albert (http://forum.videolan.org/viewtopic.php?t=18573)

		   Warning hack inside.
		   refs #495 close it for linux and win32
		   

* Do not make a vlc_object_find to find the playlist, since we may get the item being preparsed. Use p_playlist->p_input instead

 * export GetFallbackEncoding()
subsdec:
 * autodetect UTF-8 encoding,
 * use better non-Unicode default encoding from language instead of
 CP1252 when local encoding is UTF-8, and local encoding in all other cases
 (should improve subtitles decoding on POSIX a lot)
 * some memory fixes
 * some cosmetic fixes

EnsureUTF8 would replace invalid bytes sequences with question marks.

Most of the code was already there anyway. This allows UTF-8 autodetection
without a dedicated UTF8-to-UTF8 iconv() handle.

* We now have an (ugly) way to rename nodes

* Fix enabling of the step forward/backward functions

According to the wxWidgets documentation, it works. But of course, you
don't want to trust the wxWidgets documentation, particularly when it
deals with characters encoding. Or rather, you'd like to trust the
documentation, but you can't trust the actual implementation to work
until you tested it.

So lets see if it works, and revert commit it tomorrow if it sucks.

  (if local charset is UTF-8, this is similar to wcstombs())
- FromUTF16(): converts a host-order UTF-16 byte sequence to UTF-8

Might fix PIC linking issues on amd64

reported by Diego 'Flameeyes' Pettenò