Support adding .ics event files to Calendar

[aecorredor]

It's honestly the only feature I can think of that is missing in the app. Adding calendar events to my iOS calendar directly from mail apps is possible on every major client. I know it's been asked before and it's been said that it was on the roadmap. I'm just surprised it's taken so long. Is there any obvious blocker that doesn't allow you guys to just add the feature?