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

[Jürgen Spitzmüller]

Am Sonntag, dem 23.10.2022 um 12:03 -0400 schrieb Scott Kostyshak:
> Can I add a layout for alertenv? And similarly, for other envs (I
> haven't checked yet which other ones we don't cover yet).
> 
> Attached is an example patch.

Sure. I think beamer has now quite a number we don't cover yet.

Don't forget the lyx2lyx stuff and format change.

-- 
Jürgen
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