cmStringAlgorithms: Add cmExpandList functions

Sebastian Holtermannrequested to merge
sebholt/cmake:cmExpandList into master

This adds the following functions to cmStringAlgorithms:

  • cmExpandList: Moved from cmSystemTools::ExpandListArgument
  • cmExpandedList: Moved from cmSystemTools::ExpandedListArgument
  • cmExpandLists: Moved from cmSystemTools::ExpandLists
  • cmExpandedLists: Moved from cmSystemTools::ExpandedLists

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