Reqest for changes in Cmakelists file

[solomoncyj]

Hi Fedora packager. do you mind making the following edits tour your cmakelist file to make it easir to package this libary for Fedora? thanks

• Use CMakePackageConfigHelpers macros 1 and include the safestringlibVersion.cmake file
• Do not manually add compilation flags (it interferes with our optimization flags), instead move them to presets and only run them in the CI
• Bump the minimum cmake version (if the minimum is too low, recent CMake changes and imporvements are not applied)
• Consider migrating the includes into dedicated subfolder

[solomoncyj]

@tomasbw

[ausyskin]

The patches are welcome, merged one now; please submit other changes what you want to review.