make sim use proper OOP

sim/main.lua

@@ -48,7 +48,7 @@ local lastfxtime = 0
 local avgticks = {}
 local totalticks = 0
 
-local sim = Simulation:new()
+local sim = Simulation.new(Simulation)
 
 local units = {
 	"uHz",
@@ -322,12 +322,12 @@ while 1 do
 			
 			if OPT_TICK_TIME==0 then
 				for i = 1, OPT_TICK_INF do
-					sim:tick()
+					Simulation.tick(sim)
 				end
 				ticks = ticks+OPT_TICK_INF
 			else
 				for i = 1, OPT_TICK_MULT do
-					sim:tick()
+					Simulation.tick(sim)
 					ticks = ticks+1
 					
 					local elapsed = os.clock()-time