Merge topic 'find-cps'

d00201afd6 Tests: Add tests for CPS find_package
65429611b9 find_package: Fix handling of relative paths in CPS
5236984a08 Help: Describe CPS support in find_package
34828650d6 find_package: Add experimental gate for CPS support
25cc83428e find_package: Actually import .cps files
91c31ada23 find_package: Actually find .cps files
b89e43b2bc find_package: Start implementing CPS search
3e9f96079d Add additional string case functions

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !10018