High fps

[haekb]

Experimental high framerate support!

What's changed?

• Replaced LTServer's GetTime and GetFrameTime functions with our own
• Custom sound timing for dialog that were using IsSoundDone()

What's left?

• Fix for ~view model~ animations (Higher fps, the slower they are!)
• Fix for some environmental sounds (like door, it seems to speed up!)

Cheers to the The_One from AVP2/LithFaq community for advice/confirmation that the engine's server code fps is locked at 100.