Parity modules to snake_case

[ticekev]

First open source contribution. Learning the lay of the land

Parity class modules updated from camelCase to snake_case

Related to Issue #1429

Todo:

• Add entry to the release notes

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[kclowes]

Thanks for the contribution @ticekev! Unfortunately, we need to deprecate these methods before moving them over to snake case, so we'll need to follow the DeprecatedMethod pattern that is laid out in #1326. This PR should also build on #1602, so if you want, once that's merged in (should be in the next couple days), then we can switch these to snake case.

[kclowes]

@ticekev #1602 has been merged in, so if you're still interested in finishing that up, you can rebase this branch on top of master and use the DeprecatedMethod pattern. PR #1828 is a good, recent example to follow. Let me know if you have questions, or feel free to close this PR if you're not interested in working on it. I'll pick it up when I get a chance unless you get there first. Thanks!

[kclowes]

Thanks for the work @ticekev! @tmckenzie51 has taken over this task