⚡ Performance optimizations

[MrKai77]

• Makes WindowRecords an actor, to prevent concurrent calls from crashing the app
• Made short-term static properties of Window cached inside a snapshot to prevent repeated calls that yield the same value (e.g. frame, isResizable)
• Updated codebase to work with the above changes accordingly (lots of async/await additions)
• Cleaned up some unused code

[github-actions]

🚧 Development Build Finished

• Version: 🧪 1.4.3 (1717)
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[github-actions]

🚧 Development Build Finished

• Version: 🧪 1.4.3 (1721)
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[github-actions]

🚧 Development Build Finished

• Version: 🧪 1.4.3 (1724)
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[github-actions]

🚧 Development Build Finished

• Version: 🧪 1.4.3 (1725)
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[github-actions]

🚧 Development Build Finished

• Version: 🧪 1.4.3 (1728)
• Workflow: View build logs & artifacts

[SenpaiHunters]

I've had it running for the past three hours. I don't see any significant issues, such as major breaks or anything that restricts my workflow, nor have I noticed any sudden spikes while running it through instruments. I believe it's ready for a development release. You can either keep this branch and push a build from it or merge it with the main development branch. It's up to you, @MrKai77.