swap extern C for CEED_INTERN

make style

add CEED_UNUSED to avoid warnings for hipblas error checking

move HIP-shared basis init routines to header

add launch bounds information for basis kernels

update some threads sizes for HIP vs CUDA

make tidy changes for HIP

add initial ported hip-shared and hip-gen backends

change HIP blocksize to 256

CI - add hipMAGMA to CI (#641)

* CI - add hipMAGMA to CI

* Magma - add clearer error message for unsupported basis ranges

* make style

add CEED_ to header guards

move basis kernels to common folder

add macro for dynamic shared memory, CUDA or HIP

rename elem restriction kernel file

move element restriction kernels to common folder

resolve merge conflicts for v0.7 release

Jeremy/py debugging (#637)

* Ceed - only store error with parent

* Python - assert state is not in write status

* Vector - add reader check to destructor

* make style

* remove debugging

Jeremy/py debugging (#637)

* Ceed - only store error with parent

* Python - assert state is not in write status

* Vector - add reader check to destructor

* make style

* remove debugging assertion

* Python - minor documentation correctness

* Python - hold reference to data array for USE_POINTER to prevent gc

* Python - hold reference to data array for USE_POINTER to prevent gc for restriction and context

* Python - use None object for initial ref back to ceed objects

* Python - add USE_POINTER to imports as needed

* Junit - update valid error message for writable access lock

* Python - change exception raised test to help gc

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update backend priority numbers

MAGMA - update backend names to new convention

OCCA - update backend resource names to match conventions

swap ordering in magma backend names

add cuda and hip tags to MAGMA backends

add magma-det backend for HIP mode

make style

Error checking for user CUfunction in CeedCudaBuildQFunction