cmStringAlgorithms: Add cmIsSpace, cmTrimWhitespace, cmEscapeQuotes and cmTokenize

Sebastian Holtermannrequested to merge
sebholt/cmake:cmStringAlgorithms_move_functions into master

This adds the following functions to cmStringAlgorithms:

  • cmIsSpace
  • cmTrimWhitespace (moved from cmSystemTools::TrimWhitespace)
  • cmEscapeQuotes (moved from cmSystemTools::EscapeQuotes)
  • cmTokenize (moved from cmSystemTools::tokenize and adapted to accept cm::string_view

The testStringAlgorithms test is extended with tests for cmTrimWhitespace, cmEscapeQuotes and cmTokenize.

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