Moving corlib files out of "System" directory into root

BeefLibs/corlib/src/IO/NullStream.bf

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace System.IO
+{
+	/// The NullStream will allow ignore all writes (returning success) and return 'no data' on all reads.
+	class NullStream : Stream
+	{				   
+		public this()
+		{
+		}
+
+		public override int64 Position
+		{
+			get
+			{
+				return 0;
+			}
+
+			set
+			{
+			}
+		}
+
+		public override int64 Length
+		{
+			get
+			{
+				return 0;
+			}
+		}
+
+		public override bool CanRead
+		{
+			get
+			{
+				return true;
+			}
+		}
+
+		public override bool CanWrite
+		{
+			get
+			{
+				return true;
+			}
+		}
+
+		public override Result<int> TryRead(Span<uint8> data)
+		{
+			return .Ok(0);
+		}
+
+		public override Result<int> TryWrite(Span<uint8> data)
+		{
+			return .Ok(data.Length);
+		}
+
+		public override void Close()
+		{
+			
+		}
+	}
+}