Remove `static constexpr` within the global kernel. This is not
supported by all CUDA versions.

psychocrypt committed 9 minutes ago
 - use precomuted indicies within the loop
 - `cn_explode_gpu` use all threads to load the state

- fix race condition during shared memory access
- optimize memory access

Co-authored-by: psychocrypt <psychocryptHPC@gmail.com>
Co-authored-by: fireice-uk <fireice-uk@users.noreply.github.com>