Make PACMANs a little better (#24604)

* PACMAN generators show network load/supply.

This gives more feedback to players that their PACMAN is properly connected and what the network status is (i.e. you don't have enough generators).

* Buff JRPACMAN to 8 kW.

Shifted all power values up by +3 kW.

They're frequently too weak to power even single rooms so they deserve a buff.

* Change unit format helpers number format.

Always displays one digit of precision. This avoids jumping around when a value is changing live.

Content.Server/Power/NodeGroups/BasePowerNet.cs

@@ -22,6 +22,8 @@ public abstract class BasePowerNet<TNetType> : BaseNetConnectorNodeGroup<TNetTyp
         PowerNetSystem = entMan.EntitySysManager.GetEntitySystem<PowerNetSystem>();
     }
 
+    public bool IsConnectedNetwork => NodeCount > 1;
+
     public void AddConsumer(PowerConsumerComponent consumer)
     {
         DebugTools.Assert(consumer.NetworkLoad.LinkedNetwork == default);