Issue based groups and its settings created

Previously a content type 'issues' was being used for similar requirement.
Many things went wrong and some requirements changed, so we have this new
content type - Group.

As per now, we would allow for only the below contents in a Group context.
News
Article
Event
Poll

And we would allow the below in a more general context -
Blog (mostly by party leaders, and professional political scientists/authors)
Basic Page
Event
Poll
News
Article
(may be another 'Pol Khol' would be added too)

references #14