Code improvements, part 0: Clippy

[ProgramCrafter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 52.38095% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 61.67%. Comparing base (cc7e2ba) to head (345e99c).

Files	Patch %	Lines
webrtc/src/peer_connection/sdp/sdp_test.rs	0.00%	0 Missing and 7 partials ⚠️
webrtc/src/ice_transport/ice_candidate.rs	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #548      +/-   ##
==========================================
- Coverage   61.70%   61.67%   -0.04%     
==========================================
  Files         529      529              
  Lines       48870    48814      -56     
  Branches    12273    12264       -9     
==========================================
- Hits        30155    30104      -51     
+ Misses       9580     9548      -32     
- Partials     9135     9162      +27     

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[ProgramCrafter]

It seems I fixed warnings but in other branch, which should've gone into part 1: doc improvements. I'll open new PR for that branch, then.