refactor: libdave camel massacre 🐪🔪

[braindigitalis]

Finally updates libdave to get rid of camelCase_ members with underscore on the end. This refactor updates:

• Public and private variables that are part of a struct or class
• Public and private class function names
• Function name parameters

Where needed, a little reformatting.

TODO at a later date: Various parts of libdave mix and match uint64_t and std::string for snowflake storage. standardize them all on D++ dpp::snowflake where possible.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[ruslan-ilesik]

🐍🔪🐪 => DPP

[Jaskowicz1]

lgtm! Thank ya for getting rid of camelCase