fix: Correct P0 deprecation

the PetscOptionsDeprecated caused the P0 option to be ignored for some
reason

fluids: Use StatePrimitive in blasius context

fluids: Make ProblemData a pointer to struct

We basically use it as a pointer-to-struct type everywhere, so might as
well make it consistent with everything else

fluids: Add diffusion to advection problem

fluids: Add stabilized mass matrix to newtonian

Testing with:
```
build/fluids-navierstokes -options_file ./examples/fluids/gaussianwave.yaml -dm_plex_box_faces 10,10,1 -ts_max_steps 500 -degree 2

fluids: Add stabilized mass matrix to newtonian

Testing with:
```
build/fluids-navierstokes -options_file ./examples/fluids/gaussianwave.yaml -dm_plex_box_faces 10,10,1 -ts_max_steps 500 -degree 2 -implicit false -ts_type rk -stab supg -ts_dt 1e-4 -implicit false -ts_monitor_solution cgns:gaussian_wave.cgns -ts_monitor_solution_interval 5 -ts_view -state_var conservative -mass_ksp_type gmres -ts_monitor -mass_pc_type jacobi -mass_pc_jacobi_type diagonal
```

show more ...

fluids: Add stabilized mass for advection

This enables "full" SUPG for the advection problem using explicit time
integrators

minor - update copyright headers

fluids: Add GetInverseMultiplicity

fluids: Sync with Ratel, get ceed-utils.h

fluids: Add different tau choices for advection

fluids: Implement bc_slip

This is a weak version of slip boundary condition based on a Riemann
solve

fluids: Implement sequential SGS DD eval

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an is

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an isotropic model later, we
can give that the "Isotropic" qualifier on it's function names
- Remove the "Model" qualifier from function names. "SgsDD" is
communicative enough (Subgrid-stress inherently means a model)

show more ...

fluids: Change SGS IFunctionApply to use NewtonianIdealGasContext

- It doesn't need anything more than that

fluids: Create generic SGS DD eval interface

- Existing implementation now called "Fused" evaluation

fluids: Replace if...SETERRQ with PetscCheck

fluids: Add missing OperatorApplyContextDestroy's

fluids: Merge 2D and 3D advection setup

Instead of `-problem advection` and `-problem advection2d`, there's just
`-problem advection` and the dimensionality is taken from the dm.

fluids: Convert strong_form to boolean in advection

fluids: Generalize advection IC for 2d and 3d

fluids: Change bubble_type to advection_ic_type

Since cosine_hill and skew aren't bubbles

fluids: Add uses_newtonian flag

fluids: Agnosticize VeloGradient projection setup

- It can now setup more than just user->grad_velo_proj

Merge pull request #1399 from CEED/jrwrigh/advection_cleanup

fluids: Cleanup advection problems

fluids: Cleanup unused struct members

Many of these are set, but never actually used.