MatrixSSL 1.2

Functional changes

• Added re-handshake support

- A connected server may issue a HelloRequest message to the client
- A connected client may issue a new ClientHello message to the server
• Added support for certificate chaining
• Added RSA_WITH_NULL_SHA1 and RSA_WITH_NULL_MD5 ciphers to provide authentication and tamper detection without encryption overhead. (Because these are less secure ciphers, they must be explicitly enabled in cipherSuite.c).

• Cleaned up several mismatched types (mostly unsigned char to char compiler warnings)
• Rework of the cipher suite logic to support re-handshaking
• Rename internal APIs to avoid namespace issues with other packages

• Added matrixSslSetSessionOption()
• Added matrixSslEncodeHelloRequest()
• Added 'next' member to the sslCertInfo_t structure. This member creates a linked list to expose certificate chains to the user.