Merge topic 'target-file-dir-refactoring'

c95a8348ce cmLocalGenerator: add an override for CMakeFiles-using paths
35d32b8741 cmLocalGenerator: move the `CMakeFiles` subdir from the target to output root
bc19e42461 generators: use `GetObjectOutputRoot` to compute target directories
b1d9a5313c cmLocalGenerator: add a `GetObjectOutputRoot` method
b82a74d918 generators: use GetSupportDirectory() in more places
36f85ee0cc cmGeneratorTarget: query the local generator for the target directory
ff5d7bc301 cmLocalXCodeGenerator: use a per-target directory
aafd771529 cmNinjaTargetGenerator: use `GetObjectFileDir` where possible
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !10812