ItemComponent syncing fixes:

- Relay and lightcomponent states are synced (otherwise clients won't be notified if the state is, for example, toggled by a signal from a button).
- Clients don't play door sounds if a signal attempts to set the state to the same value as the predicted state, but DO play if a correction from the server changes the state from the predicted one.
- Clients are notified if a reactor receives a shutdown signal.
- Powercontainer updates are sent if the charge changes by 1%, not by 1 unit.

Subsurface/Source/Items/Components/Power/PowerContainer.cs

@@ -56,7 +56,7 @@ namespace Barotrauma.Items.Components
                 if (!MathUtils.IsValid(value)) return;
                 charge = MathHelper.Clamp(value, 0.0f, capacity); 
 
-                if (Math.Abs(charge - lastSentCharge) > 1.0f)
+                if (Math.Abs(charge - lastSentCharge) / capacity > 1.0f)
                 {
                     if (GameMain.Server != null) item.CreateServerEvent(this);
                     lastSentCharge = charge;