Improve fps limiter performance

[adfriz]

New: Rewrite FPS limiter for accuracy and performance

Replace the old sleep-based limiter with a cross-platform FrameLimiter
(Thread.Sleep bulk wait + Thread.Yield tail, following OpenTK 4.x).

• 1ms timer resolution on Windows while waiting; restored on exit
• Double-precision timeslot calculation for accurate frame pacing
• Skip raising timer resolution when the frame overran its slot
• Skip pacing above ~330fps where sleep-based limiting is impractical
• Make hard FPS cap to 1000; fix OverflowException on unlimited
• Add 45 and 75 FPS presets to the FPS limit option

I hope this lower the power consumption when use fps preset and better frame pacing.

Vsync options not changed.