AutoFrameSkip: Graphics option to reduce lag by slow

Skips drawing every second frame if drawing the previous frame was too slow
Setting is controlled by game host
Default: on

Imported from Clonk Rage

From e6e680f49ac50a352e9a051ee21622e7f00648b6 Mon Sep 17 00:00:00 2001
From: sven2 <sven2@786b8e90-9c09-0410-89a9-bccc6ef1e79b>
Date: Sat, 21 Sep 2013 21:34:44 +0000
Subject: [PATCH] + AutoFrameSkip: Graphics option to reduce lag by slow
 clients in network games

git-svn-id: https://www.clonk.de:83/svn/clonk/stable@14501 786b8e90-9c09-0410-89a9-bccc6ef1e79b
Remove obsolete effect level slider and configuration option