Make use of BinaryPrimitives

[Apollo3zehn]

dotnet/corefx#24400

[aviatrix]

I've tried to implement this, but there was issue where there's no switch from endianness on span/memory, just on primitive types.
So, we might have to remove switching endianness on span/memory or leave it as is

FluentModbus/src/FluentModbus/ModbusUtils.cs

Lines 161 to 178 in 39d819d

	public static void SwitchEndianness<T>(Span<T> dataset) where T : unmanaged
	{
	var size = Marshal.SizeOf<T>();
	var dataset_bytes = MemoryMarshal.Cast<T, byte>(dataset);
	for (int i = 0; i < dataset_bytes.Length; i += size)
	{
	for (int j = 0; j < size / 2; j++)
	{
	var i1 = i + j;
	var i2 = i - j + size - 1;
	byte tmp = dataset_bytes[i1];
	dataset_bytes[i1] = dataset_bytes[i2];
	dataset_bytes[i2] = tmp;
	}
	}
	}

[Apollo3zehn]

That's good to know, thanks :-) I'll leave this issue open as a reminder to completely review the server/client API to work with different byte layouts.