Most were still at 3.1 which prompts noisy warnings from up-to-date CMake versions.
Version requirements have been removed entirely from dependent subprojects, all others were upped to 3.16.
It's "doom.id.doom1/2" instead of "doom.doom1/2" now.
The config file's content will be renamed and for lump filtering a fallback has been added - note that you cannot combine both naming schemes! The old one has to be considered deprecated now.
This also removes the duplicated content necessitated by the old naming scheme.
