Migrate from to_text/parse_test to Marshaling compatible dump/load methods

[dapi]

No description provided.

[0crat]

@yegor256/z please, pay attention to this issue

[0crat]

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[yegor256]

@dapi can you please explain more? I'm not sure I understand what is "marshalling" here.

[dapi]

Use this interface to dump in to string (byte stream) and restore from the string in ruby:

Class#load
object.dump

Override basic implementation of these methods in class Zold::Score.

This it a ruby's notation provided by Marshal module and is supported by many other marshalling users.

[yegor256]

@dapi can you submit a pull request?