Add more options to FPS Limiter

[Mimonsi]

I'd like to have more options for the FPS-Limiter than the current 30 and 60 Frames. I use a 240 hz monitor, Options for 120, 144, 240 and 300 FPS would be great.

[andrewpey]

Added 75, 144, and 240 Target FPS options, available in the latest beta branch build.