Improve Fuelwood Tick performance

Improves server performance of Fuelwood Heater by:
- Preventing it from doing unnecessary operations when it has no fuel and no temperature.

- Reducing fuel value checks of empty container items.

This is a block that gets spammed a lot for steam generation so these small tweaks go a long way.

src/main/java/mekanism/common/tile/TileEntityFuelwoodHeater.java

@@ -25,9 +25,10 @@ public class TileEntityFuelwoodHeater extends TileEntityContainerBlock implement
 {
 	public double temperature;
 	public double heatToAbsorb = 0;
-	
+
 	public int burnTime;
 	public int maxBurnTime;
+	public int checkDelay;
 
 	/** Whether or not this machine is in it's active state. */
 	public boolean isActive;
@@ -73,45 +74,54 @@ public void onUpdate()
 					Mekanism.packetHandler.sendToReceivers(new TileEntityMessage(Coord4D.get(this), getNetworkedData(new ArrayList())), new Range4D(Coord4D.get(this)));
 				}
 			}
-			
+
 			boolean burning = false;
-			
+
 			if(burnTime > 0)
 			{
 				burnTime--;
 				burning = true;
 			}
 			else {
-				if(inventory[0] != null) {
-					int fuelTime = TileEntityFurnace.getItemBurnTime(inventory[0]);
+				if (inventory[0] != null) {
+					if (checkDelay == 0) {
+						int fuelTime = TileEntityFurnace.getItemBurnTime(inventory[0]);
 
-					if (fuelTime > 0) {
-						maxBurnTime = burnTime = fuelTime / 2;
+						if (fuelTime > 0) {
+							maxBurnTime = burnTime = fuelTime / 2;
 
-						if (burnTime > 0) {
-							inventory[0].stackSize--;
+							if (burnTime > 0) {
+								inventory[0].stackSize--;
 
-							if (inventory[0].stackSize == 0) {
-								inventory[0] = inventory[0].getItem().getContainerItem(inventory[0]);
-							}
+								if (inventory[0].stackSize == 0) {
+									inventory[0] = inventory[0].getItem().getContainerItem(inventory[0]);
+								}
 
-							burning = true;
+								burning = true;
+							}
+						} else {
+							checkDelay = 60;
 						}
+					} else {
+						checkDelay--;
 					}
 				}
 			}
-
+
+
 			if(burning)
 			{
 				heatToAbsorb += general.heatPerFuelTick;
+				setActive(true);
+			} else if (isActive) {
+				setActive(false);
+			}
+
+			if (this.getTemp() > 0 || heatToAbsorb > 0) {
+				double[] loss = simulateHeat();
+				applyTemperatureChange();
+				lastEnvironmentLoss = loss[1];
 			}
-
-			double[] loss = simulateHeat();
-			applyTemperatureChange();
-
-			lastEnvironmentLoss = loss[1];
-
-			setActive(burning);
 		}
 	}