Merge topic 'deprecate-pre-2.8.12'

5845c218d7 Deprecate compatibility with CMake versions older than 2.8.12
7b07ccdd2b Tests/*Only: Update cmake_minimum_required versions
9b99b4bfc8 Tests/RunCMake: Update cmake_minimum_required versions
fcea4a3b45 cmStateSnapshot: Invert CanPopPolicyScope return value to match name

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !4897