Merge topic 'while-regression'

eae125ace5 Refactor: Get rid of `isTrue` variable in the `while` block execution
4c1cdfd8f0 Refactor: Keep `cmWhileFunctionBlocker` members private
d22f68d019 Refactor: Transform `while` loop into `for`
e97e714f0d Fix: `while()` reports an error the same way as `if()`
880ca66b51 Fix: `while()` can silently ignore incorrect condition
61b33c3f4e Fix: Regression in the `cmConditionEvaluator::HandleLevel0`

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6442