D bindings for Intel's ISA-L_crypto library

• Using DStep and some manual editing
• Based on ISA-L_crypto v2.21.0

Generating the bindings

1. Generate include files with

make -f Makefile.unx install

2. Generate D files with

dstep -I. --package=deimos.isal_crypto **/*.h

3. Rename and move .d files to conform to package names (e.g deimos/isal_crypto/package.d, deimos/isal_crypto/aes_cbc.d)
4. Edit deimos/isal_crypto/package.d to add the public imports present in isa-l_crypto.h and fix the module name