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]

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 ⚠️
src/rdo.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            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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