server: remove port requirement, permit running on paths

[Scrxtchy]

Unrestricts types when using settings values via CLI, permitting users to use otherwise unused code to run the server while listening to a path.

By setting yarg's type of the floodServerPort to a string, the support is maintained to respect a number value through the NormalisePort function, if the user supplies a number, it is treated as a number despite being of a string type.

I've added a process.on('exit') check to the web server, as if you don't properly close the listen server on a socket, the socket is never cleaned up and is regarded still in use on the next startup

Related Issue

closes #679

Screenshots

flood running behind an nginx proxy via proxy_pass http://unix:/home/scratch/flood/flood.sock;

Types of changes

• Breaking change (changes that break backward compatibility of public API or CLI - semver MAJOR)
• New feature (non-breaking change which adds functionality - semver MINOR)
• Bug fix (non-breaking change which fixes an issue - semver PATCH)

[jesec]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@713b1d9). Click here to learn what that means.

❗ Current head bf28e78 differs from pull request most recent head a73b515. Consider uploading reports for the commit a73b515 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #680   +/-   ##
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  Coverage          ?   77.09%           
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  Files             ?       61           
  Lines             ?    11313           
  Branches          ?     1284           
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  Hits              ?     8722           
  Misses            ?     2577           
  Partials          ?       14           

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[Scrxtchy]

ran npx prettier -w server/bin/web-server.ts, lol