* OpenTK.Compatibility.csproj: * Audio/OpenAL/AL/EffectsExtensionPresets.cs: Fixed/suppressed all build warnings.
Moved SoundData and SoundFormat to OpenTK.Compatibility. Moved AL and Alc classes to OpenTK.Audio.OpenAL and added the previous namespace to OpenTK.Compatibility. Removed SoundData wrappers from AL class. Updated samples to use the new API.