add ContentInitEvent (#3951)

* add ContentInit(ialized)Event

* a

* a

core/src/mindustry/core/ContentLoader.java

@@ -1,5 +1,6 @@
 package mindustry.core;
 
+import arc.*;
 import arc.files.*;
 import arc.func.*;
 import arc.graphics.*;
@@ -7,8 +8,10 @@ import arc.struct.*;
 import arc.util.*;
 import mindustry.content.*;
 import mindustry.ctype.*;
+import mindustry.game.EventType.*;
 import mindustry.entities.bullet.*;
 import mindustry.mod.Mods.*;
+import mindustry.net.*;
 import mindustry.type.*;
 import mindustry.world.*;
 
@@ -97,6 +100,7 @@ public class ContentLoader{
     public void init(){
         initialize(Content::init);
         if(constants != null) constants.init();
+        Events.fire(new ContentInitEvent());
     }
 
     /** Calls Content#load() on everything. Use only after all modules have been created on the client.*/

core/src/mindustry/core/Control.java

@@ -424,7 +424,7 @@ public class Control implements ApplicationListener, Loadable{
         net.dispose();
         Musics.dispose();
         Sounds.dispose();
-        ui.editor.dispose();
+        if(ui != null && ui.editor != null) ui.editor.dispose();
     }
 
     @Override

core/src/mindustry/core/Renderer.java

@@ -111,7 +111,10 @@ public class Renderer implements ApplicationListener{
         minimap.dispose();
         effectBuffer.dispose();
         blocks.dispose();
-        planets.dispose();
+        if(planets != null){
+            planets.dispose();
+            planets = null;
+        }
         if(bloom != null){
             bloom.dispose();
             bloom = null;

core/src/mindustry/game/EventType.java

@@ -64,6 +64,8 @@ public class EventType{
     public static class CoreItemDeliverEvent{}
     /** Called when the player opens info for a specific block.*/
     public static class BlockInfoEvent{}
+    /** Called *after* all content has been initialized. */
+    public static class ContentInitEvent{}
     /** Called when the client game is first loaded. */
     public static class ClientLoadEvent{}
     /** Called when a game begins and the world is loaded. */