Merge topic 'feature/message-indent'

5f6fd917 message(): Control indentation via CMAKE_MESSAGE_INDENT

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3464
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passed cmake-dash3win10-windows-release-ninja

00:24:08

passed cmake-minoc-linux-release-lint-iwyu-tidy

00:28:23

passed cmake-moonshade-osx-debug-ninja

00:24:46

passed cmake-terfin-windows-release-vs2019

01:12:16