Cleanup custom lints

[shssoichiro]

• Move custom lints from lib.rs/main.rs into Cargo.toml
• Remove most custom lints, as this is overkill and difficult to maintain
• Fix new lints from most recent Rust version

[lu-zero]

Looks like few more need to be addressed

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.72%. Comparing base (3c3a26f) to head (33258e5). Report is 24 commits behind head on master.

Files	Patch %	Lines
src/bin/decoder/y4m.rs	0.00%	1 Missing :warning:
src/rdo.rs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3387 +/- ## ========================================== + Coverage 88.52% 88.72% +0.20% ========================================== Files 89 89 Lines 28323 27755 -568 ========================================== - Hits 25074 24627 -447 + Misses 3249 3128 -121 ```

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