[LyX/master] Basic support for the ltx-talk class

[Juergen Spitzmueller]

commit dddfb483df4fef4000c0f2bbe400e0c4063a6868
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat May 16 09:35:19 2026 +0200

    Basic support for the ltx-talk class
    
    ltx-talk is a new presentation class that is supposed to replace beamer
    in the long term (also according to current beamer maintainers who are
    directly involved in ltx-talk development).
    It is basically a complete reimplementation of beamer from scratch using
    modern l3 technologies with the main aim to provide tagging functionality
    (which is not possible to implement in beamer).
    The interface is inspired by beamer and the goal is to make it easy to
    transform existing beamer documents to ltx-talk.
    
    The class is still in rather early stage of development, far from feature
    completeness. Design is very basic at the moment since the focus is on
    core functionality. Also, the class relies on current l3 technologies,
    hence rather recent LaTeX core system.
    
    The layout and example file implements and documents what is supported
    currently and will follow on the implementation of features in the future.

 lib/Makefile.am                             |    6 +-
 lib/examples/Presentations/LTX-Talk.lyx     | 5192 +++++++++++++++++++++++++++
 lib/layouts/ltx-talk.layout                 | 1709 +++++++++
 lib/templates/Presentations/LTX-Talk.lyx    |  178 +
 lib/templates/de/Presentations/LTX-Talk.lyx |  178 +
 5 files changed, 7262 insertions(+), 1 deletion(-)