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- Remove an useless variable

- Add support for RTP padding

By the way, the MPEG-Video parser seems to ignore the MP2V specific
extra header (i.e. it passes it onto the demux instead of removing it).
Not sure if this is intended (any MPEG expert?)

(seriously, you should have switched to RTP for ages though)

This is no excuse for using TCP instead of UDP/UDP-Lite when you can.

Fortunately, the harm potential of this old bug seems pretty low

This is completely untested because vlc does not link at the moment :(

* 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.

(otherwise e.g. MPEG2 video is mistetected as MPEG-PS)

as large as +/- 25 msec and too frequent audio up/down sampling

Closes #414