Refactor: Replace custom WriteAllBytes with File API

Removed the custom WriteAllBytes method from the Program class,
which handled writing a ReadOnlySpan<byte> to a file. Updated
the code to use the built-in File.WriteAllBytes method instead.
This change simplifies the codebase by leveraging .NET's
standard library functionality and eliminates redundant code.

Author: ds5678

AssetRipper.TextureDecoder.ConsoleApp/Program.cs

@@ -61,7 +61,7 @@ static void Main(string[] args)
 		switch (outputType)
 		{
 			case "bgra":
-				WriteAllBytes(path + ".bgra", bitmap.Bits);
+				File.WriteAllBytes(path + ".bgra", bitmap.Bits);
 				break;
 			case "bmp":
 				bitmap.FlipY();
@@ -243,11 +243,4 @@ private static void DecodePvrtc(ReadOnlySpan<byte> input, int width, int height,
 		bool do2bit = bool.Parse(do2bitModeString);
 		PvrtcDecoder.DecompressPVRTC<ColorBGRA32, byte>(input, width, height, do2bit, output);
 	}
-
-	public static void WriteAllBytes(string path, ReadOnlySpan<byte> bytes)
-	{
-		ArgumentException.ThrowIfNullOrEmpty(path, nameof(path));
-		using Microsoft.Win32.SafeHandles.SafeFileHandle sfh = File.OpenHandle(path, FileMode.Create, FileAccess.Write, FileShare.Read);
-		RandomAccess.Write(sfh, bytes, 0);
-	}
 }