Enhance frame rate calculations with double and SDL performance counter

[MAJigsaw77]

• Updated frame rate calculations to improve timing accuracy.

• Replaced Uint32 with double for precise timing values.

• Switched from SDL_GetTicks() to SDL_GetPerformanceCounter() and SDL_GetPerformanceFrequency() for high-resolution timing.

[NeeEoo]

Just Fyi: SDL_AddTimer takes a uint32 (ms) and not a double, so this still causes the framerate to be slightly off. A possible fix would be using std::chrono

[Dimensionscape]

I appreciate the initiative, but this doesn't resolve any problems, and increases cpu usage. We are going to handle this in a very different way in the next(probably) version of lime.

[NeeEoo]

When sdl 3 is implemented we can use SDL_GetTicksNS to get nanoseconds instead and its in Uint64

[Dimensionscape]

The plan is to stop using SDL to construct the main loop.

When sdl 3 is implemented we can use SDL_GetTicksNS to get nanoseconds instead and its in Uint64