Merge topic 'export-refactor-for-cps'

ff24058e46 export: Use std::all_of to collect exports
20fa4ce8d8 export: Factor out CMake-specific export generation (2/2)
6c66340a64 export: Fix const placement
1bceab3520 export: Factor out CMake-specific export generation (*/2)
a6cc595772 export: Factor out CMake-specific export generation (1/2)
0352376e44 export: Immediately report actual version required

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !9646