Theorem LieModule.span_weight_eq_top_of_ker_traceForm_eq_bot

feat: the annihilator of the kernel of the trace form of a Lie module is contained in the span of its weights (#8739)

feat: generalise results about Lie module weight spans from Abelian to nilpotent Lie algebras (#8718)

feat: the roots of a Lie algebra with non-singular Killing form span the dual of the Cartan subalgebra (#8688) …