waterbox - remove some unused saverammerer junkus

ngp doesn't use this, so...

src/BizHawk.Emulation.Cores/Waterbox/CustomSaverammer.cs

@@ -1,34 +0,0 @@
-using BizHawk.Emulation.Common;
-using System;
-
-namespace BizHawk.Emulation.Cores.Waterbox
-{
-	internal class CustomSaverammer : ISaveRam
-	{
-		private readonly ICustomSaveram _s;
-		private readonly int _size;
-
-
-		public CustomSaverammer(ICustomSaveram s)
-		{
-			_s = s;
-			_size = s.GetSaveramSize();
-		}
-
-		public bool SaveRamModified => _size > 0;
-
-		public byte[] CloneSaveRam()
-		{
-			var ret = new byte[_size];
-			_s.GetSaveram(ret, ret.Length);
-			return ret;
-		}
-
-		public void StoreSaveRam(byte[] data)
-		{
-			if (data.Length != _size)
-				throw new InvalidOperationException("Wrong size saveram");
-			_s.PutSaveram(data, data.Length);
-		}
-	}
-}

src/BizHawk.Emulation.Cores/Waterbox/LibWaterboxCore.cs

@@ -129,14 +129,4 @@ namespace BizHawk.Emulation.Cores.Waterbox
 		[BizImport(CC)]
 		public abstract void SetInputCallback(EmptyCallback callback);
 	}
-
-	/// <summary>
-	/// if a core implements this, it will be used for saveramming instead of memory domains
-	/// </summary>
-	interface ICustomSaveram
-	{
-		int GetSaveramSize();
-		void PutSaveram(byte[] data, int size);
-		void GetSaveram(byte[] data, int size);
-	}
 }

src/BizHawk.Emulation.Cores/Waterbox/WaterboxCore.cs

@@ -79,10 +79,6 @@ namespace BizHawk.Emulation.Cores.Waterbox
 					.ToArray();
 				_saveramSize = (int)_saveramAreas.Sum(a => a.Size);
 
-				var sr = _core as ICustomSaveram;
-				if (sr != null)
-					_serviceProvider.Register<ISaveRam>(new CustomSaverammer(sr)); // override the default implementation
-
 				_exe.Seal();
 			}
 		}