* add support for negative timestamps
* add support for the delay parameter
* add support for reading the DVD palette of vobsubs
* free the used memory when we close the vobsubs

To use it, put a string in p_object->psz_header, all messages from this object and its parent will have the header prepended

Revert revision 13903. It is implemented in a different way by checking if the option --dshow-chroma is set. If it is set then the chroma is forced, otherwise it is not. This should solve the regression of previous commit, by letting users specify the chroma type to use. To get the previous default behaviour specify IV420 as preferred chroma type either on the commandline or in the Capture Device advanced tab.

  No longer use the charset of the OS. OS X is UTF-8 for instance, but most subs are simply in Latin-1.
* In case we did BOM detection with stream_ReadLine, set subsdec-encoding to UTF-8 automatically.

Get input bitrate

Remove unconditionally enforcing of "preferred" media type upon the capture devices. Some devices don't handle this properly, which often results in a BSOD. By not setting a preferred media type the problem dissappears. Please check this with other type of devices for any regression.