Merge branch 'Add CSPRNG'

.gitmodules

bootstrap.sh

epicardium/epicardium.h

epicardium/meson.build

epicardium/modules/hardware.c

epicardium/modules/meson.build

epicardium/modules/modules.h

epicardium/modules/rng.c

epicardium/modules/trng.c

lib/crypto/SHA256

lib/crypto/meson.build

lib/crypto/tiny-AES-c

lib/meson.build

pycardium/modules/os.c