Add features to change dedicated server FPS and network send rate

[jsza]

Dedicated server FPS defaults to 30 (see Game.Start and FejdStartup.Start).

ZDOMan.SendZDOToPeers only sends data every 0.05 seconds (20/sec) by default. We can increase both of these values to make gameplay smoother! Maybe force send rate to be same as framerate by default.

[jsza]

Actually, while the dedicated server FPS feature might make sense because it’s useless without Serverside Simulations, changing network send rate is probably better off in a separate plugin.