do not use vlc_t to store psz_pidfile

Someone should really review it as it is my first experience in C.

- also fixed a similar potential issue on subtitles.
- lesson for today: Be careful when you use p_parent of an object.
- i chose not to use vlc_object_find, but yield/release instead because of the speed implications.

  - some elements are not yet supported.
  - it could perhaps use a little bit more cleaning.

In the basics. It just works :D

* Set Connection:Close for HTTP 1.1 streams that are not continious 

300 468 Annex A. Please test

TODO: This convertion should be done on strings received from SDT and 
EIT (and possibly others) in the TS demux as well.

Fix makefile

- Remove old kludges (get yourself a decently recent Mingw32 or die)

* Beginning of core implementation

  my algorithm is still not perfect: it should take account of the "thumb length"

  but I don't have a real video/audio file to test it...

instead of the painfully braindead one from wship6 that we'd rather
flatly ignore

Microsoft was probably too much afraid that developpers would request
version 0.2 instead of 2.0 so they switched straight from 1.1 to 2.2.