code: Rename Event to Input and Message to Output

[romac]

Part of: #68

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1dafd49) 95.63% compared to head (0d783f4) 95.64%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
Code/round/src/input.rs	0.00%	1 Missing ⚠️
Code/vote/src/keeper.rs	92.31%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   95.63%   95.64%   +0.01%     
==========================================
  Files          31       31              
  Lines        1830     1833       +3     
==========================================
+ Hits         1750     1753       +3     
  Misses         80       80              

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