amadeus: Add missing compressor effect from REV11 (#4010)

* amadeus: Add missing compressor effect from REV11

This was in my reversing notes but seems I completely forgot to
implement it

Also took the opportunity to simplify the Limiter effect a bit.

* Remove some outdated comment

* Address gdkchan's comments

Ryujinx.Audio/Renderer/Parameter/Effect/CompressorParameter.cs

@@ -0,0 +1,115 @@
+using Ryujinx.Audio.Renderer.Server.Effect;
+using Ryujinx.Common.Memory;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Parameter.Effect
+{
+    /// <summary>
+    /// <see cref="IEffectInParameter.SpecificData"/> for <see cref="Common.EffectType.Compressor"/>.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct CompressorParameter
+    {
+        /// <summary>
+        /// The input channel indices that will be used by the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        public Array6<byte> Input;
+
+        /// <summary>
+        /// The output channel indices that will be used by the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        public Array6<byte> Output;
+
+        /// <summary>
+        /// The maximum number of channels supported.
+        /// </summary>
+        public ushort ChannelCountMax;
+
+        /// <summary>
+        /// The total channel count used.
+        /// </summary>
+        public ushort ChannelCount;
+
+        /// <summary>
+        /// The target sample rate.
+        /// </summary>
+        /// <remarks>This is in kHz.</remarks>
+        public int SampleRate;
+
+        /// <summary>
+        /// The threshold.
+        /// </summary>
+        public float Threshold;
+
+        /// <summary>
+        /// The compressor ratio.
+        /// </summary>
+        public float Ratio;
+
+        /// <summary>
+        /// The attack time.
+        /// <remarks>This is in microseconds.</remarks>
+        /// </summary>
+        public int AttackTime;
+
+        /// <summary>
+        /// The release time.
+        /// <remarks>This is in microseconds.</remarks>
+        /// </summary>
+        public int ReleaseTime;
+
+        /// <summary>
+        /// The input gain.
+        /// </summary>
+        public float InputGain;
+
+        /// <summary>
+        /// The attack coefficient.
+        /// </summary>
+        public float AttackCoefficient;
+
+        /// <summary>
+        /// The release coefficient.
+        /// </summary>
+        public float ReleaseCoefficient;
+
+        /// <summary>
+        /// The output gain.
+        /// </summary>
+        public float OutputGain;
+
+        /// <summary>
+        /// The current usage status of the effect on the client side.
+        /// </summary>
+        public UsageState Status;
+
+        /// <summary>
+        /// Indicate if the makeup gain should be used.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool MakeupGainEnabled;
+
+        /// <summary>
+        /// Reserved/padding.
+        /// </summary>
+        private Array2<byte> _reserved;
+
+        /// <summary>
+        /// Check if the <see cref="ChannelCount"/> is valid.
+        /// </summary>
+        /// <returns>Returns true if the <see cref="ChannelCount"/> is valid.</returns>
+        public bool IsChannelCountValid()
+        {
+            return EffectInParameterVersion1.IsChannelCountValid(ChannelCount);
+        }
+
+        /// <summary>
+        /// Check if the <see cref="ChannelCountMax"/> is valid.
+        /// </summary>
+        /// <returns>Returns true if the <see cref="ChannelCountMax"/> is valid.</returns>
+        public bool IsChannelCountMaxValid()
+        {
+            return EffectInParameterVersion1.IsChannelCountValid(ChannelCountMax);
+        }
+    }
+}