plus several minor bugfixes in SAP announce

OTOH, SAP is currently broken for standard output (and untested for RTP)

To be continued

* libvlc sources and plugins now define __LIBVLC__ and headers exported to
  plugins (ie, include/vlc_*.h) check for this
* libvlc sources use the value of the "libvlc" component in vlc-config instead
  of vlc
* Apply flags directly to "libvlc" in configure.ac - might temporarily break win32 :)

* Headers in include must contain the structures and prototypes needed
  by the plugins and should be named vlc_*.
* Headers in include/vlc must contain the structures and prototypes
  needed by external libvlc clients

* Moved and renamed some things in headers. 
   - Removed vlc_cpu.h, vlc_error.h (merged in vlc_common)
   - Removed snapshot.h (merged in vlc_vout.h)
   - Removed vlc_spu.h (merged in vlc_osd.h)
   - Removed intf_eject.h and vlc_interaction.h (merged in vlc_interface)
   - Moved all internal headers to src
   - Merged vlc_video.h and video_output.h and move private things to src
   - Removed vlc/intf.h, vlc/aout.h, vlc/vout.h, vlc/decoder.h and vlc/input.h
     (meta headers for use in modules, and often implying too large 
     dependencies)
* Removed some useless dependencies
* Unexported a bunch of functions and structures used only in src/
  (--> Still some work here)
* Finally made input_thread_t and input_source_t (mostly) private. 
  Added input_GetItem to fetch the input_item of an input_thread
* Cleaned up deprecated entries in vlc_symbols.h and bumped up symbol 
  prefix

This commit has a 99% probability of breaking the build, 0.1% of killing
your cat and 0% of getting you hot chicks.

Minor headers cleanup

  m=video 1234 udp 33      for raw UDP
  m=video 1234 RTP/AVP 33  for RTP

Forward port of branches/0.8.1-jpsaman-thedj revision 12070. The OSD menu subsystem consists of two parts a core part (src/osd, include/vlc_osd.h) and a subfilter (modules/video_filter/osdmenu.c). The OSD menu can be used locally or it can be streamed. It depends on the way the functionality is called from the vlc commandline. Currently there is only one way to make the subpictures appear on the video and that is through the rc-interface. The following commands are supported by it: "menu on" (show OSD menu), "menu off" (hide OSD menu), "menu left" (highlight button on the left), "menu right" (highlight button on the right), "menu up" (highlight button above), "menu down" (highlight button below) or "menu select" (perform hotkey action). When there is no button on the left, right, up or down then the menu-command will be ignored.

To stream use a commandline similar to this:

./vlc dvdsimple:///dev/dvd --sub-filter=osdmenu --osdmenu-file=share/osdmenu/default.cfg --extraintf rc --sout '#transcode{sfilter=osdmenu}:std{mux=ts,access=udp,url=127.0.0.1:1234}' -vvvv

For local playback a commandline like this is needed:

./vlc dvdsimple:///dev/dvd --sub-filter=osdmenu --osdmenu-file=share/osdmenu/default.cfg -vvvv

Have fun with the basic functionality - jpsaman.

* libvlc: Conversion functions (needs performance improvement)
          Convert filenames from command line
* SAP, Skins2: no perform own UTF-8 conversion
* file, playlistold : convert
* wx, winCE : assume UTF-8

(da big courmischage)

- automatically select SAP multicast address (closes #141)
- some clean up

* fix bug in previous SAP commit

  This way we can later on set IP6 instead of IP4 in a SDP.
* modules/stream_out/rtp.c: accept sdp=sap as a valid option.
* src/stream_output/sap.c: 
  - Set the SAP packet Hash headerfield to a unique value based on mtime
    Patch by Philippe van Hecke <philippe at belnet dot be>
  - Set SAP packet IPv6 field to 1 if we are a ipv6 session
  - Made some preperations for setting the origin ip address in the header as well,
    anyone any ideas on how to retrieve the current origin IP address???

access_out, mux, stream_out to the creator to make VLC_VAR_DOINHERIT
working.
 (Basically it takes an options list that will be 'var_Created' and if present
in sout_cfg_t initialised).

  - The SAP handler now runs in a separate thread.
  - RTP sessions can be announced with sap (sdp=sap://,name=...)
	TODO: Make this more configurable
  - Better SDP generation (the timestamp problem is not resolved)
	About this, there is a problem : as, for a RTP session, the URI
        is the complete SDP, if the session is recreated, as the URI has 
        changed, a new item is added to the playlist
  - Experimental flow control algorithm :
       It does not follow the "Recommended" implementation, as it needs
       to count the sessions (to achieve this, we should make this work
       together with the SAP listener)
       It is disabled by default (use --sap-flow-control to enable).
       When it is disabled, sap announcement interval is set by --sap-interval

* src/misc/net.c : created net_ReadNonBlock
* sap.c : Fixed memory problem

 this way meta data will be available for stream_outs and muxers.
 The only 'problem' is that it will be available for sure only after
 that the first data packet is received by the stream output.

  (temporary).

* Removed trailing spaces

* src/stream_output/stream_output.c, include/stream_output.h: new sout_AccessOutRead() funcion.
* modules/access_output/file.c: implemented sout_AccessOutRead().
* modules/access_output/udp.c: coding style cleanup.
* modules/mux/mp4.c: Added support for generating "fast start" files (ie. with the moov header at the beginning of the file).
   Started some code cleanup.

* include/stream_output.h, src/stream_output/stream_output.c: added a SOUT_MUX_CAP_GET_ADD_STREAM_WAIT muxer capability to specify that a muxer prefers to wait all ES before starting muxing.
* modules/mux/ogg.c: use SOUT_MUX_CAP_GET_ADD_STREAM_WAIT.
* modules/stream_out/transcode.c: fix for video stream header generation (theora).
* modules/codec/theora.c: don't overwrite headers.

 (may be readded later).

 * mpgv.c: new demuxer using the packetizer (allow to stream ES).

  corrupt packets. Also flag GOP headers with SOUT_BUFFER_FLAGS_GOP.