D15559: Python bindings: use cmake_parse_arguments, fix documentation

[Stefan Brüns]

bruns added a reviewer: dfaure.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D15559

To: bruns, #frameworks, dfaure
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns