P21 issues faced

[shakeabi]

• "class" keyword used in many places - js
• member option in form breaks editregistrants and viewregistrants
• Mass mailing module doesn't work as it still uses sendmail - use implemented messenger class
• User management- downloading xls / viewing with selected fields is screwed up
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• Use tinymce4 instead of the given editor (feature request)
• Weed out all security issues (i'm not sure what are the issues, many people are claiming)
• create an api provider so that we can use react and stuff