Merge topic 'parser-cleanup'

4959276c02 cmListFileCache: Remove cmCommandContext
0386641142 cmListFileCache: Rename FromCommandContext to FromListFileFunction
3c4fa4c892 cmListFileCache: Move cmListFileFunction earlier

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !6899