Address some clippy lints

[Mingun]

Replaces, closes #899

I made my own PR, because I cannot push to the original.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 79.59184% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.17%. Comparing base (38b44d4) to head (8fa6c6a).
⚠️ Report is 53 commits behind head on master.

Files with missing lines	Patch %	Lines
src/events/mod.rs	0.00%	8 Missing ⚠️
examples/flattened_enum.rs	0.00%	1 Missing ⚠️
src/events/attributes.rs	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #911      +/-   ##
==========================================
+ Coverage   55.52%   58.17%   +2.64%     
==========================================
  Files          42       42              
  Lines       15511    15546      +35     
==========================================
+ Hits         8613     9044     +431     
+ Misses       6898     6502     -396     

Flag	Coverage Δ
unittests	58.17% <79.59%> (+2.64%)	⬆️

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