support avs+'s new pixel types.

also, add new option 'filters'.

fix possibility of memory leaks.

also, add version resource.

fix calculating video duration of -info

also, show avisynth version string on -info.

fix video output when avs has no audio.

1.0.1

fix typo.

Rewite almost code.

• change avisynth_c.h to Avisynth+MT's avisynth.h.
• change C99 to C++11.
• change mingw-w64 to VisualC++2015.
• drop Avisynth2.5x support.
• drop WindowsXP support.
• drop x264bd and x264raw options.
• add Avisynth+MT's new HBD formats support.
• add FFmpeg's extended Y4M formats output support.