Switch build system away from imake

[morgant]

MLVWM currently uses the old imake build system, but it should really be switched to something more modern with better cross-platform support, but keeping it as light-weight as possible. Maybe CMake?

[ThomasAdam]

I think this is possibly a good idea.

A good starting point might be to take the generated Makefiles from image and start from there -- that would allow you to assess how complex the dependencies are.

On the x11cp project, I've started doing this. But I would be more likely to recommend mason rather than cmake.