Update ffmpeg
Update ffmpeg for jp2k crash fix
Avoid calling av_dict_get twice on the same value
Store LCID value in stream struct
Remove StreamInfo function

The StreamInfo has long been generated during stream creation.
Update ffmpeg for tiny s302m improvement
Disable multi-threading for audio codecs.

This doesn't do anything yet, but ensures that future ffmpeg changes don't enable it.
Use absolute path for rundll32 arguments
Use proper signature for OpenConfiguration function
Check the demuxer was created before transition into Pause mode

Fixes issue 363
Add manifest files to control dll loading.

This should ensure that different versions of LAVFilters can be safely loaded at the same time.

Thanks to Lord for his help.