Merge topic 'genex-list-filter-transform-predicate'

0b5a172c22 Help: hyperlink $<_0> and configure-time commands in $<LIST> docs
092edb6860 GenEx: add $<LIST:FILTER> PREDICATE filter and REGEX keyword
d2ad140ef9 GenEx: add PREDICATE selector to $<LIST:TRANSFORM>
6024f624b0 GenEx: factor TRANSFORM action descriptor lookup

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !12213