Added support for CCM and CCM_8 cipher suites.
Added AES+GHASH implementation using AES-NI opcodes; also ARM-Thumb assembly for faster Montgomery multiplication on Cortex-M0+. Added selection functions for "default" implementations.
Activated Curve25519 support for ECDHE cipher suites.
Added ChaCha20+Poly1305 support (stand-alone, cipher suites).
Initial import.