Fermi v0.4.0

Diff since v0.3.0

Closed issues:

• Reformulate BasisSet fields (#104)
• libcint: use Julia Artifact libcint_jll.jl (#111)
• Drop deps/build.jl (#113)

Merged pull requests:

• (T) improved, new implementations added (#107) (@gustavojra)
• Use libcint_jll instead of cmake in deps/build.jl (#111) (#112) (@carstenbauer)
• Major refactorization: AO Integrals moved into GaussianBasis.jl (#114) (@gustavojra)
• Documentation (#115) (@gustavojra)