[engine] Restrict host_timescale to reduce abuse chances

ValveSoftware/source-sdk-2013#562

engine/host.cpp

@@ -505,7 +505,8 @@ static ConVar	host_profile( "host_profile","0" );
 
 ConVar	host_limitlocal( "host_limitlocal", "0", 0, "Apply cl_cmdrate and cl_updaterate to loopback connection" );
 ConVar	host_framerate( "host_framerate","0", 0, "Set to lock per-frame time elapse." );
-ConVar	host_timescale( "host_timescale","1.0", FCVAR_REPLICATED, "Prescale the clock by this amount." );
+// dimhotepus: Lock host_timescale min/max to prevent abuse.
+ConVar	host_timescale( "host_timescale","1.0", FCVAR_REPLICATED, "Prescale the clock by this amount.", true, 0.0001f, true, 1.2f );
 ConVar	host_speeds( "host_speeds","0", 0, "Show general system running times." );		// set for running times
 
 ConVar	host_flush_threshold( "host_flush_threshold", "20", 0, "Memory threshold below which the host should flush caches between server instances" );

game/client/perfvisualbenchmark.cpp

@@ -233,7 +233,7 @@ void CPerfVisualBenchmark::Stop()
 #endif
 	m_bIsOn = false;
 	Print();
-	engine->ClientCmd_Unrestricted("host_timescale 0");					// pause the mofo
+	engine->ClientCmd_Unrestricted("host_timescale 0.0001");					// pause the mofo
 //	engine->ClientCmd_Unrestricted("unpause");				// unpause the mofo
 //	engine->ClientCmd_Unrestricted("wait");				
 	engine->ClientCmd_Unrestricted("toggleconsole");