Zero wait yields (#11561)

* Zero wait yields

* Zero wait yields (fix)

core/src/mindustry/logic/LExecutor.java

@@ -1167,7 +1167,12 @@ public class LExecutor{
 
         @Override
         public void run(LExecutor exec){
-            if(curTime >= value.num()){
+            if(value.num() <= 0){
+                // Just yield without executing the wait again
+                exec.yield = true;
+                // Start the next wait afresh ('value' might have been modified remotely by a different processor)
+                curTime = 0f;
+            }else if(curTime >= value.num()){
                 curTime = 0f;
             }else{
                 //skip back to self.