Refactor OSLib

- Replaced magic numbers with meaningful constants for better readability.
- Modularized common logic in trigonometric and frame sync functions.
- Improved naming conventions and added descriptive comments.
- Optimized input validation in trigonometric functions (angle handling).
- Simplified frame synchronization logic and added support for dynamic frameskip and VSync.
- Completed system initialization and PSP-specific callback setup.
- Enhanced the benchmarking utilities for more accurate performance measurements.
- Improved memory alignment and optimized memset for hardware acceleration.