The singinterval module

The `singinterval` module
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## The `singinterval` module

This is an exercise where the program display an interval and play the first tone. Then the user should sing the interval, and then click a button to hear the correct answer. There is no microphone support yet.

User documentation is in « Entoar o intervalo ».

Here is a minimal lesson file:

    header {
      module = singinterval
      lesson_id = "a400df62-e007-4a1b-9057-cd05397e88a2"
      version = "3.1.4"
      title = "Thirds"
      ask_for_intervals_0 = [3, 4]
      test = "3x"
      test_requirement = "90%"
    }

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