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/DeviceSinkCommand.cs

@@ -34,10 +34,12 @@ namespace Ryujinx.Audio.Renderer.Dsp.Command
             SessionId = sessionId;
             InputCount = sink.Parameter.InputCount;
             InputBufferIndices = new ushort[InputCount];
+            
+            Span<byte> inputSpan = sink.Parameter.Input.AsSpan();
 
             for (int i = 0; i < Math.Min(InputCount, Constants.ChannelCountMax); i++)
             {
-                InputBufferIndices[i] = (ushort)(bufferOffset + sink.Parameter.Input[i]);
+                InputBufferIndices[i] = (ushort)(bufferOffset + inputSpan[i]);
             }
 
             if (sink.UpsamplerState != null)