mail/rainloop: Upgrade 1.8.2 -> 1.9.2
mail/rainloop-community: new slave port, community edition

rainloop is a modern and interactive webmail.

Changelog since 1.8.2:
http://www.rainloop.net/changelog/

PR: 200091
Submitted by: brnrd
Approved by: loic.blot@unix-experience.fr (maintainer)