Merge topic 'FindwxWidgets-more-versions' into release-3.24

2a19231d61 FindwxWidgets: Support more wxWidgets versions, including 3.2
853449429d FindwxWidgets: Use version number from header for library names
ed51e0bb75 FindwxWidgets: Move extracting version number to a macro

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !7448