polyphony-chat / chorus / #75

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Split up gateway, fix a few clippy warnings (#436)

As the title suggests, `Gateway` has been split up into several files,
due to it being several hundred locs in length and, in my opinion,
becoming difficult/frustrating to navigate.

I have also fixed 2 clippy warnings: I have refactored an `if
x.is_some()... { x.unwrap() }` into the more idiomatic `if let Some(y) =
x ...`, and I have removed the duplicate definition of `NSFWLevel` in
`types/invite`.

100 of 132 new or added lines in 6 files covered. (75.76%)

1050 of 2019 relevant lines covered (52.01%)

8.14 hits per line