patch: adding alertenv (and other friends) for beamer layout

[Jürgen Spitzmüller]

Am Dienstag, dem 25.10.2022 um 21:15 -0400 schrieb Scott Kostyshak:
> Is this something you think I can do for 2.4.0 or should I hold off?
> I forget what the current status is.

The problem is nobody knows that. Personally I am trying to hold back
all new features. I do not find adding a few styles and insets
problematic, though, so I'd say go ahead.

-- 
Jürgen
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