Merge MR !72, 'jrwrigh/jit_changes', into 'main'

fix: Change QFunctions to account for libCEED#1696

See merge request phypid/honee!72

fix: Change QFunctions to account for libCEED#1696

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

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 #1345 from CEED/jrwrigh/fluids-asan

fluids: Add ASAN, Correct memory out-of-bounds error

fluids: Add ASAN, Correct memory out-of-bounds error

Merge pull request #1149 from CEED/jrwrigh/newtonian_ddsgs

fluids: Data-driven SGS modeling

fluids: Add symmetric eigensolver QF helper

- Adapted from https://github.com/jewettaij/jacobi_pd