Fix/questionnaire exports

[verarojman]

🎩 What? Why?

This PR fixes some bugs related to exporting questionnaires and adds some other improvements:

• Exports
  • Adds options hash for export_manifest to decide whether file should be zipped
  • Makes surveys exports not be zipped by default to improve UX
• Form PDF
  • Render newlines for short_answer and long_answer answers
  • Render matrix answers correctly
  • Remove ip_hash to improve readability of participant information
• Bugfixes
  • Remove bug happening when exporting answers to questions with position: nil

📌 Related issues

• Related to Fix export all different question types #27

📋 Subtasks

• Add tests
• Add question_count to questionnaire to skip separators in count >> fix completion percentage calculation for questionnaires
• Check why organization logo is not being rendered in pdf
• Design for PDF footer 'made with Decidim'
• Change export email message so it doesn't say "zipped"

[microstudi]

@verarojman Important bug:
It seems that if you have more than one component with surveys, export results show all the results for all the components mixed.

[microstudi]

Completion seems capable of exceeding 100% using matrix questions