[Suggestion] Add "Deprecations Removed in Release" Page

[richgt]

Currently, as we're upgrading releases (we're on 3.4, heading to 3.8), in a very large app, we're not always able to remove deprecations as they're added (sendAction is a really good example, we have WAY too many uses to remove them right away). I'd really love to be able to click on a page to see what deprecations are no longer valid in a release (the Until has expired in this release), so they may actually be removed, or have been removed. This could be implemented as a toggle (Deprecated in release vs. Removed / Until release).

[pzuraq]

I just discussed this with @richgt, I think it would definitely be really helpful!

[kennethlarsen]

Is this something you think would be fixed by the WIP filtering feature? #361