feat(advdif): Add diffusion tau coefficient

Merge MR !38, 'jrwrigh/advdif_sine_wave', into 'main'

feat(advdiff): Add sine and square wave ICs

See merge request phypid/honee!38

style(advdif): Add prefix to typedef enums

feat(advdif): Add sine and square wave IC

Merge branch 'jrwrigh/qdataunpack_nd' into 'main'

refactor: Move N-dimensional QdataUnpack* to utils.h

See merge request phypid/honee!34

refactor: Move N-dimensional QdataUnpack* to utils.h

Merge branch 'jrwrigh/misc_refactor' into 'main'

refactor: Clean up global struct members

See merge request phypid/honee!31

feat: Add jac_data_size_vol

- Allows non-Jacobian examples to not have to set zeros to it's inputs
- Removes the need for `uses_newtonian` (newtonian itself can not add
the extra term for IDL)

Merge branch 'jrwrigh/refactor_nom' into 'main'

refactor: norm -> normal, and others

See merge request phypid/honee!25

refactor: norm -> normal, and others

Merge branch 'jrwrigh/license_changes' into 'main'

Update License post libCEED fork

See merge request phypid/honee!6

chore: Move to Apache-2.0 OR BSD-2-Clause

fluids: Add diffusion to advection problem

Merge pull request #1543 from CEED/jrwrigh/explicit_stabilized_mass

Fluids: Add stabilized mass operator for advection problem

fluids: Add stabilized mass for advection

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

Merge pull request #1551 from CEED/jrwrigh/sycl_advection

fix(fluids): Allow advection to work with SYCL backends

fix(fluids): Allow advection to work with SYCL backends

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all sin

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all singly included headers

* jit - drop most guards on backend JiT files

* sycl - drop extra header guards

* jit - enable #pragma once for QF source

* fluids - use #pragma once for util/helper qf source

* test - check different multiple includes

* fluids - fix odd include

* jit - update interface for building JiT string from multiple files

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

Use #pragma once for non-JiT headers

minor - update copyright headers

Merge pull request #1500 from CEED/jrwrigh/advection_typo

fix(fluids): RHS stabilization term should be negative

fix(fluids): RHS stabilization term should be negative

fluids: Add different tau choices for advection

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: Generalize advection boundary qfunctions