Types need to be cleaned up

[nefrathenrici]

Many of the types used in AtmosModel and elsewhere are difficult for a user to construct. We should improve the interface to make it easier for users to customize their model.

Incomplete list of types that need to be improved:

• RRTMGPI radiation modes
• EDMFXModel
• Hyperdiffusion
• SmagorinskyLilly
• NOGW/OGW
• Rayleigh/ViscousSponge
• AtmosNumerics
• SlabOceanSST
• TracerNonnegativityElementConstraint