Codex/c200 minimal

[elcritch]

I used Codex/GPT5.3 to do some debugging and setup basic c200 telemetry support. The encryption is different than other models, but adding a unencrypted flag let me read some data.

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@elcritch Is your device running older firmware? My C300(X) and C1000(X) used to transmit unencrypted telemetry but stopped doing it with a firmware update released about a year ago. I kind of don't want to support old firmware versions if it can be avoided.

If not I have a bunch of changes in the works (#16) which adds support for Anker prime devices which use a different encryption scheme so I ended up moving a lot of the code around so the encryption and processing methods could be overriden by implementing classes, so I would prefer to wait until that's merged as it will make it way cleaner for the C200 to override the encryption/decryption/negoitation methods.

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@elcritch The changes under #16 have now been merged. It should make it possible to override things like the negotiation and processing methods to bypass decryption. Look at anker_prime.py to see how thats done and if you need any help let me know :)