Some CMake maintenance

[LecrisUT]

• cmake_minimum_required has to be before project
• Add a higher-bound CMake policy
• Use the GNUInstallDirs defaults, LIB_SUFFIX was never a standardized variable

[gdevenyi]

Superceeded by #136

[LecrisUT]

@gdevenyi please check again the diff of this PR, the changes are quite different, beyond the cosmetic change in #136

[gdevenyi]

Sorry I failed to look closely. Would you please rebase to resolve the conflicts and I'll take a better look.

[LecrisUT]

Sorry I failed to look closely. Would you please rebase to resolve the conflicts and I'll take a better look.

Here you go. I did not look carefully into BuildNIFT when I first wrote this, but I highly suggest to change that into a FetchContent approach instead.

[gdevenyi]

Did you test all the up to 4.2?

[LecrisUT]

Hoping primarily that the CI can pick up on any issues. This can easily be added with https://github.com/jwlawson/actions-setup-cmake if you are interested.

Overall though the thing that this one does is set the policies to new, and if something on the list does not catch the attention, it should mostly be fine (preferably if the CI checks it as well)

[gdevenyi]

Would you pleas rebase one more time on master, we updated our build workflows. Thanks!

[gdevenyi]

Thanks for the followup, it passes the current CI and I'll look at the cmake actions one you suggested.