ffmpeg: Add support for arbitrary ffmpeg options in ffmpeg_producer
Fix so that arbitrary ffmpeg parameters allow more than just one parameter.

* https://github.com/cambell-prince/Server/issues/4
Fix #157: Can now open media with digit only names.
Merge pull request #162 from cambell-prince/bug/157

Fix #157: Can now open media with digit only names.
* amend to fix #157: Made the same change to LOAD
#155

Fixed problem where SFML stops calling SoundStream::OnGetData when too few samples are returned. This problem seems to have started after the change to static linking against SFML. The current solution is to collect the samples of more frames (3) before returning sample data. This unfortunately adds a 2 frame delay on system audio, but solves the choppyness.
Merge pull request #145 from cambell-prince/ffmpeg-dshowparams

ffmpeg: Add support for arbitrary ffmpeg options in ffmpeg_producer
Replaced openal with portaudio for lower latency