Windows: Server FPS/Tickrate

By default you may witness server FPS capped to 64 FPS, as well as a fluctuating update rate (as observed by net_graph on the client.)

The solution is to enable the Windows high-resolution timer, which can be achieved by tools such as HiResTimer.

This is a cleaner solution than the traditional srcdsfpsboost.exe, as it installs as a service rather than requiring someone to be logged in.