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

Merge pull request #1553 from CEED/jrwrigh/ns_stabilized_mass

fluids: Add stabilized mass operator for Newtonian

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
```

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Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

fluids: Implement bc_slip

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

fluids: Replace if...SETERRQ with PetscCheck

fluids: Add uses_newtonian flag

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.

Merge pull request #1371 from CEED/kjansen/DropPotentialFromEtot

Drop Potential Energy from Etot conservation variable

deleted all the unused coordinate references that were throwing warnings

Potential energy removed from all state helpers so no more x (or dx) dependence for them. Interior integrals still need x for IDL but boundary elements don't so removed. This touches lots of qfuncti

Potential energy removed from all state helpers so no more x (or dx) dependence for them. Interior integrals still need x for IDL but boundary elements don't so removed. This touches lots of qfunctions that make state calls and a few problems as well

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deleted all the unused coordinate references that were throwing warnings

Potential energy removed from all state helpers so no more x (or dx) dependence for them. Interior integrals still need x for IDL but boundary elements don't so removed. This touches lots of qfuncti

Potential energy removed from all state helpers so no more x (or dx) dependence for them. Interior integrals still need x for IDL but boundary elements don't so removed. This touches lots of qfunctions that make state calls and a few problems as well

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Merge pull request #1259 from CEED/jrwrigh/fluids-cleanup

fluids: Misc cleanup

fluids: Correct PetscFunction{Return,BeginUser} placement

- Respect the PETSc standard for style (https://petsc.org/release/developers/style/#coding-conventions-and-style)

Merge pull request #1286 from CEED/jrwrigh/refactor_gravity

fluids: Refactor gravity option

fluids: Refactor gravity option

- Use `-gravity` instead of `-g`
- Enforce that the input should be a length 3 vector
- Update documentation

Misc: Also update documented default value for `mu`.

Merge pull request #1282 from CEED/jrwrigh/fix-dim-options

fluids: Reset dim before reference_velocity option

fix(fluids): Reset dim before reference_velocity option

If `-g` is not given, then
`PetscOptionsRealArray(..., "-g", ...)`
will set `dim` to zero. This then causes
`PetscOptionsScalarArray(..., "-re

fix(fluids): Reset dim before reference_velocity option

If `-g` is not given, then
`PetscOptionsRealArray(..., "-g", ...)`
will set `dim` to zero. This then causes
`PetscOptionsScalarArray(..., "-reference_velocity", ...)`
to not read any values.

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fluids: Add PetscCallCeed

fluids: Add user argument to problem print functions

Merge pull request #1234 from CEED/jrwrigh/fluids_64int

fluids: Compatability for PETSc w/ 64bit ints

fluids: Remove problem->bc function pointers

- Not needed, as essential boundary conditions go through
`DMPlexInsertBoundaryValues_NS` or
`DMPlexInsertBoundaryValues_StrongBC`