Merge branch 'CMake_improvements' into 'develop'

Base/CMakeLists.txt

CMakeLists.txt

Core/CMakeLists.txt

Device/CMakeLists.txt

Fit/3rdparty/RootMinimizers/CMakeLists.txt

Fit/CMakeLists.txt

GUI/CMakeLists.txt

GUI/main/CMakeLists.txt

Param/CMakeLists.txt

Sample/CMakeLists.txt

Tests/Functional/PyEmbedded/CMakeLists.txt

cmake/BornAgain/Compiler.cmake

cmake/BornAgain/Dependences.cmake

cmake/BornAgain/Pack.cmake

cmake/BornAgain/Qt.cmake

cmake/BornAgain/SwigLib.cmake

cmake/BornAgain/Windows.cmake