Centralized executor

core/src/mindustry/net/BeControl.java

@@ -17,7 +17,6 @@ import mindustry.ui.dialogs.*;
 
 import java.io.*;
 import java.net.*;
-import java.util.concurrent.*;
 
 import static mindustry.Vars.*;
 
@@ -25,7 +24,6 @@ import static mindustry.Vars.*;
 public class BeControl{
     private static final int updateInterval = 60;
 
-    private ExecutorService executor = Threads.executor(1);
     private boolean checkUpdates = true;
     private boolean updateAvailable;
     private String updateUrl;
@@ -168,7 +166,7 @@ public class BeControl{
     }
 
     private void download(String furl, Fi dest, Intc length, Floatc progressor, Boolp canceled, Runnable done, Cons<Throwable> error){
-        executor.submit(() -> {
+        mainExecutor.submit(() -> {
             try{
                 HttpURLConnection con = (HttpURLConnection)new URL(furl).openConnection();
                 BufferedInputStream in = new BufferedInputStream(con.getInputStream());