CTAN Update: l3kernel + l3experimental + NEW l3backend

[CTAN Announcements]

The LaTeX Team  submitted updates to the

             l3kernel + l3experimental

bundles, as well as a _new_ bundle:

                   l3backend .

Version:  2019-07-01
License:  lppl1.3c

Summary description:  LaTeX3 programming conventions

Announcement text:
----------------------------------------------------------------------
 
 # `l3kernel`

 ## [2019-07-01]

 ### Added

 - Moved `lstr-convert` module to `l3kernel`

 ### Changed

 - Ensure `\msg_fatal:nn` ends the TeX run if used inside an
   hbox (see #587)
 - Moved backend code to a separate release schedule

 ### Fixed

 - Handling of control sequences in key names (see #594)

 -------

 # `l3backend`

 ## [2019-07-01]

 ### Added

 - Driver support for anonymous objects

 ### Changed

 - Moved backend code to separate release module `l3backend`
 - Include `l3backend` in file names
 - Moved backend code to internal for each 'parent' module

 -------

 # `l3experimental`

 ## [2019-07-01]

 ### Added

 - New module `l3pdf`

 ### Removed

 - `l3str-convert` module: moved to `l3kernel` (`expl3` core)

----------------------------------------------------------------------

The packages’ Catalogue entries can be viewed at
   https://ctan.org/pkg/l3kernel
   https://ctan.org/pkg/l3backend
   https://ctan.org/pkg/l3experimental

The packages’ files themselves can be inspected at
   http://mirror.ctan.org/macros/latex/contrib/l3kernel/
   http://mirror.ctan.org/macros/latex/contrib/l3backend/
   http://mirror.ctan.org/macros/latex/contrib/l3experimental/

------------------------------------------------------------------------

   Thanks for the upload.

     For the CTAN Team
    Petra Rübe-Pugliese

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