Make schematics build insulated blocks first, power nodes last (#4414)

* Make schematics build insulated blocks first, power nodes last

* Add schematicPriority property to sort by

* Assign schematicPriority of 10 to power diode

core/src/mindustry/world/blocks/power/PowerDiode.java

@@ -22,6 +22,7 @@ public class PowerDiode extends Block{
         insulated = true;
         group = BlockGroup.power;
         noUpdateDisabled = true;
+        schematicPriority = 10;
     }
 
     @Override

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

@@ -43,6 +43,7 @@ public class PowerNode extends PowerBlock{
         outputsPower = false;
         canOverdrive = false;
         swapDiagonalPlacement = true;
+        schematicPriority = -10;
         drawDisabled = false;
 
         config(Integer.class, (entity, value) -> {