Replace float/UInt64 durations by a more precise Time class (#388)

Improve Clock class with atomic RestartIfOver method and allows to choose required precision

src/Nazara/Audio/SoundEmitter.cpp

@@ -105,6 +105,17 @@ namespace Nz
 		return m_source->IsSpatializationEnabled();
 	}
 
+	/*!
+	* \brief Seek the sound to a point in time
+	*
+	* \param offset Time offset to seek
+	*/
+	void SoundEmitter::SeekToPlayingOffset(Time offset)
+	{
+		UInt64 microseconds = static_cast<UInt64>(std::max(offset.AsMicroseconds(), Int64(0)));
+		SeekToSampleOffset(SafeCast<UInt32>(microseconds * GetSampleRate() / 1'000'000));
+	}
+
 	/*!
 	* \brief Sets the attenuation
 	*