16e6b690ad
This fixes building machines with the flake-parts module. Since the inventory merges the machines, the `clan.core.meta` attribute is now a submodule and conditionally imported. Also drops the following attributes: - clan.core.meta.icon - clan.core.meta.description In favor of specifying them inside the inventory. This doesn't use `mkRemovedOptionsModule`, because in our case it would cause infinite recursion.