Add togglable webserver with built-in web-client

[GregHib]

Adds an optional web-server on startup to allow playing through the browser (see setup in README.md).

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.91%. Comparing base (b178eab) to head (87846b0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
game/src/main/kotlin/Main.kt	0.00%	22 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
game/src/main/kotlin/Main.kt	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

@@             Coverage Diff              @@
##               main    #1285      +/-   ##
============================================
- Coverage     43.92%   43.91%   -0.01%     
  Complexity    10711    10711              
============================================
  Files          2081     2081              
  Lines         96029    96050      +21     
  Branches      15501    15506       +5     
============================================
  Hits          42179    42179              
- Misses        47833    47854      +21     
  Partials       6017     6017              

Components	Coverage Δ
Content	44.20% <0.00%> (-0.02%)	⬇️
Engine	45.68% <ø> (ø)
Network	71.85% <ø> (ø)

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