DVDStyler 3.0.4

# Changes:
- disabled copy option for non-MPEG2 video streams
- added parameter "-pix_fmt yuv420p" to transcoder
- fixed displaying first video frame in frame button
- changed transcoding caching to allow put multiple equal video files on DVD (e.g. with different cut points)
- added support of EXIF metadata in slideshow
- added CBR option for menu and slideshow enoding settings (disabled by default)
- added Bulgarian translation (thanks to Ivan Dobrev)
- win32/win64: updated Manolito's VBR plug-in

# Changes:
- improved handling of process messages
- changed encoding of menu and slideshow to use constant bitrate (CBR)
- fixed using of transcoding cache after restarting of DVDStyler
- win32/win64: updated Manolito's VBR plug-in and enabled by default
- win32/win64: updated ffmpeg to version 3.1.2 (rogerdpack build with Windows-XP patch)

* fixed using of transcoding cache after restarting of DVDStyler
* included Manolito's VBR plug-in

* added support of animations.
* added validation of menu cell actions.
* added option "keep aspect ratio" for image in frame.
* added option "add chapter at title end".
* added option to downmix audio to stereo.
* fixed setting of chapters if video is cut.
* fixed fade in/out if video is cut.
* fixed applying of audio filters if mplex is used.
* added support of MPC-HC.
* audio normalization: added clipping protection.
* interlaced encoding: added -alternate_scan parameter.
* added clear cache button in settings dialog.
* added Manolito's VBR plug-in.
* added scrollbar to video object box in title properties.
* added support of metadata (chapter and audio/subtitle language names).
* added possibility to force display subtitles (but it doesn't work in VLC).
* added menu templates "Heart" and "MothersDay" (thanks to Gerd Altmann for the images).
* fixed some bugs.
* win32: updated ffmpeg to version 3.0.