Allow to import changelog from CSV or xls file

Add features like related post, comment integration, page type format and embeddable content (videos/audios, mindmap etc).

The line line could probably have a searchable time or month selector, to narrow down updates of that month, and search function for a tag or topic

Drafts page should have a checkbox next to each entry. Selected drafts can be published all at once. According to the dates that are set in the draft entries, they are appropriately published or scheduled.