Interpret CMD as CTRL for cross-platform keybind compatibility

[tcatlas]

📋 Description

Adds support for interpreting the ⌘/CMD/Meta key as CTRL on macOS and correctly displays the keybind in the UI. I opted to treat the CMD key this way since keybinds are synced at the server and treating them separately would impact cross-platform compatibilty. One thing to note, however, is keybinds that are set by the user using the CMD key are not treated as a CTRL keybind, so if the user desires to maintain cross-platform compatibilty, they should define keybinds using the CTRL key.

This change may require the user to reset keybinds to work correctly. Tested working on Windows and macOS.

🚀 Changes made to ...

• 🔧 Server
• 🖥️ Client
• 📚 Documentation
• 🔄 Other: ___

✅ Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have looked for similar pull requests in the repository and found none

🔗 Related Issues

Fixes #882

[gnmyt]

Thanks again for your contribution! I couldn't test this directly since I don't own any Mac hardware but the code looks good to me.