ftinspect: Add CMake & Dropping QMake support

Current ftinspect supports two build systems: QMake and Meson. I'm planning to introduce CMake build files and drop the support for QMake:

• QMake is only supported by QtCreator, while CMake is supported by a lot of IDEs
• It's hard to maintain files for three build systems.
• CMake supports more advanced operations like complicated scripting, and has better compatibility for other tools like package managers.