Memory Changes part 2

* Slightly refactors RangeLists from the last Memory Changes MR, which fixes issue 61.

* Convert as many const size array iterators to span iterators as possible. When iterating over a const size array, every iteration created a Span, now only the first iteration does in most places.

* Now using object pooling for a few object types that were rapidly deleted and recreated.

* Converted a few flag checks to binary operations to save memory allocations.

src/Ryujinx.Audio/Renderer/Dsp/Command/PcmInt16DataSourceCommandVersion1.cs

@@ -42,10 +42,12 @@ namespace Ryujinx.Audio.Renderer.Dsp.Command
             Pitch = serverState.Pitch;
 
             WaveBuffers = new WaveBuffer[Constants.VoiceWaveBufferCount];
+            
+            Span<Server.Voice.WaveBuffer> waveBufferSpan = serverState.WaveBuffers.AsSpan();
 
             for (int i = 0; i < WaveBuffers.Length; i++)
             {
-                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref serverState.WaveBuffers[i];
+                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref waveBufferSpan[i];
 
                 WaveBuffers[i] = voiceWaveBuffer.ToCommon(1);
             }