Efficiently use in-order and out-of-order queues in the SYCL backends (#1456)

* Efficiently use both in-order and out-of-order sycl queues. (#59)

* Default to in-order queues.

* Only order que

Efficiently use in-order and out-of-order queues in the SYCL backends (#1456)

* Efficiently use both in-order and out-of-order sycl queues. (#59)

* Default to in-order queues.

* Only order queue as necessary.

* Use the same queue recursively through a hierarchy of Ceed objects,

* Adds missing changes from previous git-cherry-pick

* Efficiently use both in-order and out-of-order sycl queues. (#59)

* Default to in-order queues.

* Only order queue as necessary.

* Use the same queue recursively through a hierarchy of Ceed objects,

* Adds missing changes from previous git-cherry-pick

* fix formatting errors

* further formatting corrections

* fix formatting errors for merge

* fix errors

* fix errors

---------

Co-authored-by: Kris Rowe <krowe@anl.gov>

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sycl - clearer template parameters

fix(sycl): Use `CEED_VECTOR_NONE` for weight evals

sycl - fix vec memory copy

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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minor - update copyright headers

tidy - fix argument name mismatch

backend - use const for backend rstr data, should never change after set

backend - use new user data copy utility

backend - mirror changes in sycl backend

backend - same memory owned/borrowed strategy for all impls

ref - simplify GetArrayWrite logic

Fix a few more CeedInt promotions

rst - clarify index checking logic

rstr - use CeedSize as loop itrs for less casting

memcheck - promote CeedInts when indexing into Evecs

ref - promote CeedInts when indexing into Evecs

cpu - consistently use SetValue to initalize CeedVectors

cpu - simplify AtPoints scratch vector initalization logic

cpu - clean up stray variable

Move fix to CeedOperatorSetupFieldsAtPoints_Ref

cpu - padd AtPoints evec for memcheck

cpu - initalize scratch vectors in AtPoints Operator impl

Update backends/cuda-ref/ceed-cuda-ref-vector.c

fix - bad reversion of change

Co-authored-by: James Wright <james@jameswright.xyz>

internal - add some missing CeedCall