Installation-specific Display Settings

Right now, display settings are shared across installs, which causes issues when switching between systems. It would help if these settings were saved per installation.

Explanation (why it matters)
- Different hardware needs different resolutions/refresh rates
- Performance profiles differ between high- and low-end PCs
- Avoids having to reconfigure every time you switch systems
- Multi-monitor setups vary across machines

Per-install display settings would make the experience smoother and more consistent.

ps: For context I'm currently playing on an old laptop and my beefy desktop. If set Quality to High on desktop and higher FPS Cap the game don't start on the laptop. I do have to change the setting on the desktop then I can launch the game on the laptop. I understand this is specific use-case however this is an expected behaviour.