Add max connections stat to power nodes (#988)

core/src/io/anuke/mindustry/world/blocks/power/PowerNode.java

@@ -151,6 +151,7 @@ public class PowerNode extends PowerBlock{
         super.setStats();
 
         stats.add(BlockStat.powerRange, laserRange, StatUnit.blocks);
+        stats.add(BlockStat.powerConnections, maxNodes, StatUnit.none);
     }
 
     @Override

core/src/io/anuke/mindustry/world/meta/BlockStat.java

@@ -21,6 +21,7 @@ public enum BlockStat{
     powerUse(StatCategory.power),
     powerDamage(StatCategory.power),
     powerRange(StatCategory.power),
+    powerConnections(StatCategory.power),
     basePowerGeneration(StatCategory.power),
 
     input(StatCategory.crafting),