CMake cleanup: use 'option' for parameters
CMake cleanup: use 'option' for parameters

Use the 'option' command for user-selectable options instead of cached
bool variables. Just like CMake recommends.

Also delete some excess whitespace.

meshell/cucumber-cpp,cucumber/cucumber-cpp,muggenhor/cucumber-cpp,cucumber/cucumber-cpp,muggenhor/cucumber-cpp,AbletonAppDev/cucumber-cpp,konserw/cucumber-cpp,meshell/cucumber-cpp,konserw/cucumber-cpp,paoloambrosio/cucumber-cpp,AbletonAppDev/cucumber-cpp,meshell/cucumber-cpp,konserw/cucumber-cpp,paoloambrosio/cucumber-cpp,cucumber/cucumber-cpp,muggenhor/cucumber-cpp,AbletonAppDev/cucumber-cpp,paoloambrosio/cucumber-cpp