[$200] Editor - supporting old and new formats

[jmgasper]

• Rich content is not displayed properly if it is converted from rich to html and from html to markdown.
• Rich content is stored in Quill format. So Quill can be converted to Markdown but it's necessary to implement a formatter.
• Only plain text formatter and html formatter are implemented in Vanilla.

The solution would be enabling Rich Editor to support existing discussion/comment created previously.
Topocder editor should be used for new comments/discussions. But there are issues when both editors are enabled. I am trying to fix it now.

[jmgasper]

Contest https://www.topcoder.com/challenges/30159993 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30159993 has been updated - it has been assigned to obog.

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[atelomycterus]

@jmgasper Please apply PRs:
#314
topcoder-platform/challenge-forum-processor#48
topcoder-platform/forums-topcoder-editor-plugin#3

Thanks!

Vanilla site

'Markdown' is used by default.
'Rich' format - Rich editor is used for existing discussions/comments created previously using Rich Editor.
'wysiwyg' format is supported. Discussions created by a challenge forum processor had this format. These discussions have plain text or simple html markup. Topcoder Editor is used for editing them, no issues with converting.

Challenge forum processor

template.json was updated. Markdown is used.

[jmgasper]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30159993

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[sdgun]

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