Remove #region usage and fix code formatting

- Replace #region/#endregion with section comments in 4 source files:
  MonkeysAudioFile.cs, MusepackFile.cs, OggFlacFile.cs, WavPackFile.cs
- Fix whitespace formatting in HighResolutionAudioTests.cs

Author: decriptor

src/TagLibSharp2/Ape/MonkeysAudioFile.cs

@@ -408,7 +408,7 @@ private static int FindAudioEnd (ReadOnlySpan<byte> data)
 		return data.Length - (int)totalTagSize;
 	}
 
-	#region File I/O
+	// ===== File I/O =====
 
 	/// <summary>
 	/// Read a Monkey's Audio file from disk.
@@ -496,8 +496,6 @@ public async Task<FileWriteResult> SaveToFileAsync (
 		return await SaveToFileAsync (_sourcePath!, fileSystem, cancellationToken).ConfigureAwait (false);
 	}
 
-	#endregion
-
 	/// <summary>
 	/// Releases resources held by this instance.
 	/// </summary>

src/TagLibSharp2/Musepack/MusepackFile.cs

@@ -437,7 +437,7 @@ private static int FindAudioEnd (ReadOnlySpan<byte> data)
 		return data.Length - (int)totalTagSize;
 	}
 
-	#region File I/O
+	// ===== File I/O =====
 
 	/// <summary>
 	/// Read a Musepack file from disk.
@@ -525,8 +525,6 @@ public async Task<FileWriteResult> SaveToFileAsync (
 		return await SaveToFileAsync (_sourcePath!, fileSystem, cancellationToken).ConfigureAwait (false);
 	}
 
-	#endregion
-
 	/// <summary>
 	/// Releases resources held by this instance.
 	/// </summary>

src/TagLibSharp2/Ogg/OggFlacFile.cs

@@ -513,7 +513,7 @@ public static OggFlacHeaderInfo Failure (string error)
 			=> new (false, null, 0, 0, error);
 	}
 
-	#region File I/O
+	// ===== File I/O =====
 
 	/// <summary>
 	/// Read an Ogg FLAC file from disk.
@@ -601,8 +601,6 @@ public async Task<FileWriteResult> SaveToFileAsync (
 		return await SaveToFileAsync (_sourcePath!, fileSystem, cancellationToken).ConfigureAwait (false);
 	}
 
-	#endregion
-
 	private readonly struct ExtractPacketResult
 	{
 		public bool IsSuccess { get; }

src/TagLibSharp2/WavPack/WavPackFile.cs

@@ -428,7 +428,7 @@ private static int FindAudioEnd (ReadOnlySpan<byte> data)
 		return data.Length - (int)totalTagSize;
 	}
 
-	#region File I/O
+	// ===== File I/O =====
 
 	/// <summary>
 	/// Read a WavPack file from disk.
@@ -516,8 +516,6 @@ public async Task<FileWriteResult> SaveToFileAsync (
 		return await SaveToFileAsync (_sourcePath!, fileSystem, cancellationToken).ConfigureAwait (false);
 	}
 
-	#endregion
-
 	/// <summary>
 	/// Releases resources held by this instance.
 	/// </summary>

tests/TagLibSharp2.Tests/Riff/HighResolutionAudioTests.cs

@@ -160,12 +160,12 @@ static BinaryData CreateWaveFormatExtensible (
 		if (subFormat == WavSubFormat.Pcm) {
 			// KSDATAFORMAT_SUBTYPE_PCM: 00000001-0000-0010-8000-00aa00389b71
 			ReadOnlySpan<byte> pcmGuid = [0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
-			                              0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71];
+										  0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71];
 			builder.Add (pcmGuid);
 		} else if (subFormat == WavSubFormat.IeeeFloat) {
 			// KSDATAFORMAT_SUBTYPE_IEEE_FLOAT: 00000003-0000-0010-8000-00aa00389b71
 			ReadOnlySpan<byte> floatGuid = [0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
-			                                0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71];
+											0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71];
 			builder.Add (floatGuid);
 		} else {
 			builder.AddZeros (16);