Release 4.0~beta1

Originally created by @intrigeri on #16822 (Redmine)

This will be the first 4.x version that’s officially supported, as in:

Once it’s out, it’ll get security support just like 3.x.
Every automated test suite scenario will have passed at least once (worst case, manually).
It must pass the subset of our manual test suite that’s about safety guarantees Tails claims to make.

Tails contributors and enthusiasts will be encouraged to use it in production.

Edited May 15, 2020 by intrigeri

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