Implement -cbc ciphers.
#297
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This PR addresses issues related to connecting to legacy Cisco devices with no upgrade path (similar to issue #277).
Changes Introduced
• Refactored cipher/mod.rs: Make room to be able to implement CBC crypto support.
• Updated cipher/block.rs: To provide an interface compatible with both streaming ciphers and CBC.
• General Cipher Updates: Light modifications to other ciphers for compatibility with the new interface.
Context
I had trouble connecting to older Cisco devices which posed challenges due to their outdated cryptographic support.