D20808: find cantor via config (and fall back to finder when not available)

[Harald Sitter]

sitter created this revision.
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REVISION SUMMARY
  this is fully backwards compatible but has the advantage that it
  
  - shows up in cmake feature summary
  - will use the config when it is available (which is at least since 19.04)

TEST PLAN
  still builds

REPOSITORY
  R262 LabPlot

BRANCH
  cantor

REVISION DETAIL
  https://phabricator.kde.org/D20808

AFFECTED FILES
  CMakeLists.txt
  cmake/FindCantor.cmake
  src/CMakeLists.txt
  tests/import_export/ASCII/CMakeLists.txt
  tests/import_export/JSON/CMakeLists.txt
  tests/import_export/MQTT/CMakeLists.txt
  tests/import_export/project/CMakeLists.txt

To: sitter
Cc: kde-edu, narvaez, apol
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