Inheritance for environments

[zandivx]

When defining new tabularray environments with \NewTblrEnviron I often find myself copying and pasting existing definitions of other environments I've created earlier. I think it would be a great option to be able to refer to existing environments and inherit their options (something like \UseTblrTemplate but for environments).

[lvjr]

Good idea. This feature may be added later this year.

[lvjr]

Created issue #37.