Replace Liferea

It has many problems and we could use Icedove instead.

Let’s use this one as meta ticket.

Feature Branch: feature/11082-deprecate-liferea

Attachments

• 0001-Add-a-wrapper-around-Liferea-to-display-a-deprecatio.patch
• tails-amd64-11082-deprecate-liferea-3.9-20180715T0939Z-5b460c1796.iso.buildlog

Subtasks

• #7626 (closed)
• #15745 (closed)
• #15775 (closed)
• #15776 (closed)

Related issues

• Related to #9989 (closed)
• Blocked by #15091 (closed)
• Blocks #15507 (closed)

Original created by @sajolida on 11082 (Redmine)