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

[Alexander Semke]

asemke accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R262 LabPlot

BRANCH
  cantor

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

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