feat(advdif): Add sine and square wave IC

feat(advdif): Add stabilization tau type to printout

fix(advdiff): Remove STAB_TAU_ADVDIFF_SHAKIB_P tau type

It's a relic of an old design and doesn't actually exist anymore
(superceded by `STAB_TAU_ADVDIFF_SHAKIB` with it's default behavior set
to ma

fix(advdiff): Remove STAB_TAU_ADVDIFF_SHAKIB_P tau type

It's a relic of an old design and doesn't actually exist anymore
(superceded by `STAB_TAU_ADVDIFF_SHAKIB` with it's default behavior set
to match `SHAKIB_P`)

show more ...

Merge MR !39, 'jrwrigh/fix_changelog', into 'main'

fix(changelog): Remove invalid flag from CHANGELOG

See merge request phypid/honee!39

fix(changelog): Remove invalid flag from CHANGELOG

Merge branch 'jrwrigh/div_diff_flux_func_ptr' into 'main'

refactor: Make Divergence of Diffusive Flux flexible with governing equations

See merge request phypid/honee!36

Merge branch 'jrwrigh/refactor' into 'main'

refactor: Use utils in setupgeo helpers, other misc refactors

See merge request phypid/honee!37

style: Use Square() instead of repeated multiplication

fix(stg): Use CalculateElementLengths for ICs

refactor: Use utils in setupgeo_helpers.h

Includes adding Norm2 and GradUnpack2

docs(qdata): Minor fix to Setup2D_3Dcoords docstring

refactor(qdata): SetupBoundaryGradient use helpers

refactor(qdata): Have ND QFs return error code

So that the more specific ones just `return Qdata*_ND(...);`.
Behavior more inline with how the state variable QFunction error codes
are handled.

refactor(div F_diff): Change Setup arguments

style(div F_diff): Use `div_*` where appropriate

feat(div F_diff): Add GetOperatorFieldData

feat(div F_diff): Use function pointers for RHS Op creation

refactor(div F_diff): DMPlexCreateFaceLabel in Initialize

Also trade out usage of user->dm for projection->dm where appropriate

Merge branch 'jrwrigh/qdata_boundary_grad_storage' into 'main'

fix: `QDataBoundaryGradientGet` use central storage

See merge request phypid/honee!35

fix: QDataBoundaryGradientGet use central storage

style: restriction -> elem_restr for QDataBoundaryGrad

Merge branch 'jrwrigh/diff_flux' into 'main'

feat: Add divergence of diffusive flux projection

See merge request phypid/honee!27

feat: Implement divergence of diffusive flux

feat: Add MatMatNM and GradUnpackN to utils

- Implemented in `StatePhysicalGradientFromReference`

doc: Documention divergence of F_diff projection