const OUString -> constexpr OUStringLiteral
* Defining the constant strings as "constexpr OUStringLiteral"
instead of using macros
* Changing "const OUString" to "constexpr OUStringLiteral" where
possible
* Using "inline" in the header files to avoid duplicate copies of the
global variable inside the files that included them
* Read more:
https://learncpp.com/cpp-tutorial/sharing-global-constants-across-multiple-files-using-inline-variables/
Change-Id: Ic0741c0044ff160734e641d072fef9be956815a3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123104
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>