GitLab

- move vlm to input/
- remove unused libvlc export

* 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.

stability and mitigate temporary OS/network jitter problems

Also removed a long unused member from the clock struct.

(da big courmischage)

added a pf_destroy to stream_t, changed all various stream_FooDestroy to
stream_Delete

    - BLOCK_FLAG_CORRUPTED : signal corrupted data (do not use anymore
 BLOCK_FLAG_DISCONTINUITY in that case)
    - BLOCK_FLAG_PREROLL : mark this block to be decoded (no matter what).
 * ffmpeg, libmpeg2: support BLOCK_FLAG_PREROLL (ie disable frame dropping).
 * input: added ES_OUT_SET_NEXT_DISPLAY_TIME to ease the work for preroll
 (untested).
 * mp4: added support for CTTS table (pts, needed for h264+bframe).
 * decoders: for now handle discontinuity and corrupted block the same way.

Won't work for many things (only those for which metadata can be gotten during initialization).

Processing is done asynchronously, use playlist_PreparseEnqueue to add an item to the queue.

 * sub ->subtitle : converted sub.c to a 'real' demux2.
 * input.c: added basic multi-input support for subtitle.
 * avi, mp4: don't exit anymore when no es selected.

 (becarefull, it's just if you can seek or not, and not if you have to
 display the progress bar, for thet last you have to check if "position"
 value get != 0.0 )
       - added "audio-delay" and "spu-delay" object variables to delay
 audio/spu to the video. They can be changed on the fly (untested).
       - renamed INPUT__GET/SET_SUBDELAY into
 INPUT_SET_SPU_DELAY and added INPUT_SET_AUDIO_DELAY
 (wrapper to "audio-delay" and "spu-delay")
 - readded INPUT_ADD/GET_INFO/INPUT_SET_NAME. Becarefull to not over-use
them, a demuxer should export DEMUX_GET_META and not using them.