Install CMake, ninja by default

The online installer nowadays optionally installs CMake and Ninja. Anyhow, these are still opt-in, and need to be explicitly selected by the user. To provide a seemless experience in Qt Creator the packages should be installed by default.

For Windows the SDK provides both 32 bit and 64 bit versions of CMake; I'd argue that , as long as we ship Qt Creator 32 bit, the 32 bit CMake should be the default, too.