Single-Winner Voting Rules

[claussmann]

Adds Plurality, Veto, k-Approval, Borda, Copeland, Approval, SAV, Fallback, Bucklin.

[codecov[bot]]

Codecov Report

Attention: 93 lines in your changes are missing coverage. Please review.

Comparison is base (2b774e3) 89.97% compared to head (fd08c5c) 83.65%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #8 +/- ## ========================================== - Coverage 89.97% 83.65% -6.32% ========================================== Files 10 12 +2 Lines 1117 1248 +131 ========================================== + Hits 1005 1044 +39 - Misses 112 204 +92 ``` | [Files](https://app.codecov.io/gh/PrefLib/preflibtools/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PrefLib) | Coverage Δ | | |---|---|---| | [preflibtools/aggregation/utilities.py](https://app.codecov.io/gh/PrefLib/preflibtools/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PrefLib#diff-cHJlZmxpYnRvb2xzL2FnZ3JlZ2F0aW9uL3V0aWxpdGllcy5weQ==) | `94.73% <94.73%> (ø)` | | | [preflibtools/aggregation/single\_winner.py](https://app.codecov.io/gh/PrefLib/preflibtools/pull/8?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PrefLib#diff-cHJlZmxpYnRvb2xzL2FnZ3JlZ2F0aW9uL3NpbmdsZV93aW5uZXIucHk=) | `17.85% <17.85%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/PrefLib/preflibtools/pull/8/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PrefLib)

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[Simon-Rey]

Great thanks!

[Simon-Rey]

Note that I have changed couple of things:

• No need to use pytest, we do everything with unittest
• Test class need to inherit from TestCase otherwise they are not picked up by automatic tools
• Renamed utilities into utils to avoid confusions
• There was no docs, which is bad
• Simplified the import statements
• Optimised some loops