Merge topic 'ctest-handler-refactoring-pre'

f5a314cc35 cmCTestGenericHandler: Add cmCTest* argument to Initialize function
20b35ef622 cmCTestBuildCommand: Make use of ProcessAdditionalValues
b3c01f70b5 ctest: Print documentation without creating a cmCTest instance
66460dc4d7 cmCTest: Cleanup ReadCustomConfigurationFileTree function
812f8cce5a cmCTest: Cleanup PopulateCustomVectors calls
e279ba06dc cmCTest: Inline InitializeTesting at its call site

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !9934