Add delayed executor service to libzontreck, moving it out of OTEMod

src/main/java/dev/zontreck/libzontreck/util/DelayedExecutorService.java

@@ -0,0 +1,65 @@
+package dev.zontreck.libzontreck.util;
+
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import dev.zontreck.libzontreck.LibZontreck;
+import net.minecraftforge.event.TickEvent.ServerTickEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.Mod.EventBusSubscriber;
+
+
+@EventBusSubscriber(modid=LibZontreck.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE)
+public class DelayedExecutorService {
+    private static int COUNT = 0;
+    public class DelayedExecution
+    {
+        public DelayedExecution(Runnable run, long unix) {
+            scheduled=run;
+            unix_time=unix;
+        }
+        public Runnable scheduled;
+        public long unix_time;
+    }
+
+    public List<DelayedExecution> EXECUTORS = new ArrayList<>();
+
+    public void schedule(Runnable run, int seconds)
+    {
+        long unix = Instant.now().getEpochSecond()+ (seconds);
+        DelayedExecution exe = new DelayedExecution(run,unix);
+        EXECUTORS.add(exe);
+    }
+
+    @SubscribeEvent
+    public void onTick(ServerTickEvent ev)
+    {
+        if(!LibZontreck.ALIVE)
+        {
+            LibZontreck.LOGGER.info("Tearing down delayed executor service");
+            
+            return;
+        }
+        Iterator<DelayedExecution> it = EXECUTORS.iterator();
+        while(it.hasNext())
+        {
+            DelayedExecution e = it.next();
+            if(e.unix_time < Instant.now().getEpochSecond())
+            {
+                it.remove();
+                Thread tx = new Thread(e.scheduled);
+                tx.setName("DelayedExecutorTask-"+String.valueOf(DelayedExecutorService.getNext()));
+                tx.start();
+            }
+        }
+    }
+
+    public static int getNext()
+    {
+        COUNT++;
+        return COUNT;
+    }
+}