Implement staggered grid free flow model
Todo:
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FluxVars and LocalResidual -
Add support for component transport -
Add support for energy transport
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Account for extrusion factor -
fluxes (see !451 (closed)) -
storage terms -
Add 2D friction term to mimic 3D flow -
Implement better tests (e.g. 3D, transient, backward-facing step, etc.)