interface - add Ceed*ReturnCeed

fix - need C string for debug printing

fix - print actual source code, not the defs only

jit - write debug info when CUDA/HIP fails to compile

minor - fix tidy warning

internal - remove some extra void* casts

Add QFunction Assembly At Points for ref backend

Merge pull request #1477 from CEED/jeremy/sycl-fallback

Fallback to sycl/ref from gen for non-tensor bases

Merge pull request #1458 from CEED/jeremy/less-lcov-excl-sycl

Reduce LCOV_EXCL markers for SYCL backends

Replace CeedOperator[Setup|Restore]InputsAtPoints_Ref with CeedOperator[Setup|Restore]Inputs_Ref

SYCL - changes to match CUDA,HIP backends

sycl: Minor typo fixes

sycl - use switch for enums

minor - reduce LCOV_EXCL markers

sycl - fallback to ref from gen for non-tensor bases

internal - more updates for const

sycl: resolve const variance

internal - consistent variable name style

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

internal: const for source paths

Add const to CeedQFunctionLoadSourceToBuffer output argument. If we
had Result, this would look like

let const source_buffer = CeedQFunctionLoadSourceToBuffer()?;

The caller is free to cast in the const when passing the output variable
if they want this semantic:

let mut source_buffer = CeedQFunctionLoadSourceToBuffer()?;

show more ...

internal - const for CeedQFunctionGetSourcePath

backend - add const to QF name acessor

gpu - clarify, falling back to */ref CeedOperator impl

gpu - add debug message when falling back

gpu - fallback from gen to shared for non-tensor

minor - use CeedSize_FMT and similar changes