Global clean and code issues fix

[Sauterelle57]

📝 Description

Address all issues identified by SonarCloud's static analysis to improve code quality and maintainability.
Apply coding style rules to all source files in the game engine code.

🔧 Main Changes

• Fix all security hotspot of sonar
• Complete most of the documentation in .hpp files
• Fix main issues on sonar

🧪 Testing

Manual testing of core features and overall usability.
CI/CD is passing (except for unit tests (28.7% != 30% required) => will be done on another branch).

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sonar-errors

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[iMeaNz]

Did not finish, but already posting this so you can check it out, re-request a review once done