Improvement in the namespace Yarhl.IO with support of Stream and performance improvements!

Breaking changes

• Drop support of .NET Framework
• Rename library Yarhl.Media to Yarhl.Media.Text
• **Remove APIs ConvertTo, TransformTo and DataStream.ReadFormat<T>()
• Obsolete IInitializer<T>. Use the constructor instead.
• DataStream does NOT throw EndOfStreamException when reading bytes.
  • ReadByte returns -1 when it reaches the end instead of throwing an exception.
  • DataReader keeps the behavior and it will throw EndOfStreamException when reading any data type.
• Move DataStream.Length setter to its own method SetLength(long).
• Rename TextReader and TextWriter to TextDataReader and TextDataWriter.
• Removed IStream interface in favor of Stream.
• TextDataReader will not return null string if it starts reading from the end already. It will throw EndOfStreamException.
• DataStream.Seek now requires a negative argument to go back positions when origin is SeekOrigin.End.