Coding tests for design patterns

Contains following tasks:

1) Choice Questions - Verify knowledge of PHP: DateTime, Fluent API, filter_var, Closing tag omission, Getting PHP configuration values, and Use of 'explode'

2) Programming task - Implement Observer pattern in RaceGame/ScoringBoard classes, implement Chain of Responsibility pattern in Card class, implement specified interfaces in PlayersList class, and add code to places anotated with @todo

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