consider efficiency in reactor heat (#11322)

* whatever

* final touches maybe

* well forget that, I m stupid

* no

core/src/mindustry/io/SaveIO.java

@@ -21,7 +21,6 @@ public class SaveIO{
     public static final byte[] header = {'M', 'S', 'A', 'V'};
     public static final IntMap<SaveVersion> versions = new IntMap<>();
     public static final Seq<SaveVersion> versionArray = Seq.with(new Save1(), new Save2(), new Save3(), new Save4(), new Save5(), new Save6(), new Save7(), new Save8(), new Save9(), new Save10(), new Save11());
-
     static{
         for(SaveVersion version : versionArray){
             versions.put(version.version, version);

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

@@ -32,6 +32,8 @@ public class NuclearReactor extends PowerGenerator{
     public float heating = 0.01f;
     /** max heat this block can output */
     public float heatOutput = 10f;
+    /** rate at which heat progress increases */
+    public float heatWarmupRate = 1f;
     /** threshold at which block starts smoking */
     public float smokeThreshold = 0.3f;
     /** heat threshold at which lights start flashing */
@@ -84,6 +86,7 @@ public class NuclearReactor extends PowerGenerator{
 
     public class NuclearReactorBuild extends GeneratorBuild implements HeatBlock{
         public float heat;
+        public float heatProgress;
         public float flash;
         public float smoothLight;
 
@@ -118,6 +121,7 @@ public class NuclearReactor extends PowerGenerator{
             }
 
             heat = Mathf.clamp(heat);
+            heatProgress = heatOutput > 0f ? Mathf.approachDelta(heatProgress, heat * heatOutput * efficiency, heatWarmupRate * delta()) : 0f;
 
             if(heat >= 0.999f){
                 Events.fire(Trigger.thoriumReactorOverheat);
@@ -127,12 +131,12 @@ public class NuclearReactor extends PowerGenerator{
 
         @Override
         public float heatFrac(){
-            return heatOutput > 0f ? heat : 0f;
+            return heatProgress / heatOutput;
         }
 
         @Override
         public float heat(){
-            return heatOutput > 0f ? heat * heatOutput : 0f;
+            return heatProgress;
         }
 
         @Override