Added SoundEffect.FromStream
Implemented an internal ctor that accepts a Stream and set FromStream to use that for Desktops.

I have FromStream throw NotImplementedEX for Android and everything else processes like normal.
Implemented an internal ctor that accepts a Stream and set FromStream to use that for all other platforms.

I have also implemented a ctor for MacOS that accepts a stream and added FromStream for it as well.
Made all versions of SoundEffect(Stream s) internal
Merge pull request #1122 from chaosnhatred/monogame_develop3d

Added SoundEffect.FromStream
Fix for compiling on Windows 8 and Windows Phone 8
Merge pull request #1158 from slygamer/winrt-soundeffect-fix

Fix for compiling on Windows 8 and Windows Phone 8