adds polls and surveys from index pages to home page featured content

[sheralim012]

addresses part of #645

• added new embedded questionnaires block for homepage featured content and article body
  • it has 2 fields, questionnaire and direct display option
• adds polls from index page as featured content of home page
• adds surveys from index page as featured content of home page
• only live polls and surveys are added as featured content
• polls will be migrated with direct display on
• surveys will migrated with direct display on/off (according to v1)

[geoo89]

This works nicely, but with V2 features in mind I'd like the following change:

Currently, we have a featured content block called 'embedded survey' which then might display a linked survey, which is misleading.
We should have featured content blocks 'Poll' and 'Embedded Poll', 'Survey' and 'Embedded Survey', 'Quiz' and 'Embedded Quiz', which you can then use for the featured content from V1 accordingly. The reason is that in V2 also surveys that are not in the index page may be featured, and the direct display flag determines how they show up in their section, which might be different from how we want to display them in the featured content. I updated the specification in #645 accordingly.

[sheralim012]

This works nicely, but with V2 features in mind I'd like the following change:

Currently, we have a featured content block called 'embedded survey' which then might display a linked survey, which is misleading. We should have featured content blocks 'Poll' and 'Embedded Poll', 'Survey' and 'Embedded Survey', 'Quiz' and 'Embedded Quiz', which you can then use for the featured content from V1 accordingly. The reason is that in V2 also surveys that are not in the index page may be featured, and the direct display flag determines how they show up in their section, which might be different from how we want to display them in the featured content. I updated the specification in #645 accordingly.

updated by replacing old embedded blocks with new embedded blocks