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* Upgrade UXStrings to version 0.7.0. Add UXStrings 4 implementation (Ada.Containers.Vectors). Use scenario variables in project files for choosing between UXStrings implementation UXS_VARIANT=UXS1..4. Add Keep_Empty_Parts default parameter to Split. * Change GNAT required version. * Bring back strings_edit source codes from Simple Components since dependancies of SC puzzled Alire. * Suppress 0.7.0 as it puzzles Alire checks. --------- Co-authored-by: Alejandro R Mosteo <amosteo@unizar.es>