Reimplement runLater without relying on MC's renderTaskQueue

Cause it's gone in 1.21.9, and really not necessary to begin with since
we have our own executor already.

src/main/java/com/replaymod/core/mixin/MinecraftAccessor.java

@@ -8,8 +8,6 @@ import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.gen.Accessor;
 
-import java.util.Queue;
-
 //#if MC>=11800
 //$$ import java.util.function.Supplier;
 //#endif
@@ -25,6 +23,7 @@ import java.util.concurrent.CompletableFuture;
 //#if MC<11400
 //$$ import net.minecraft.client.resources.IResourcePack;
 //$$ import java.util.List;
+//$$ import java.util.Queue;
 //#endif
 
 @Mixin(MinecraftClient.class)
@@ -53,8 +52,6 @@ public interface MinecraftAccessor {
     //#endif
 
     //#if MC>=11400
-    @Accessor
-    Queue<Runnable> getRenderTaskQueue();
     //#else
     //$$ @Accessor
     //$$ Queue<FutureTask<?>> getScheduledTasks();

src/main/java/com/replaymod/core/versions/scheduler/SchedulerImpl.java

@@ -5,6 +5,8 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.util.crash.CrashException;
 import net.minecraft.util.thread.ReentrantThreadExecutor;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -82,10 +84,13 @@ public class SchedulerImpl implements  Scheduler {
         }
     }
     public final ReplayModExecutor executor = new ReplayModExecutor("Client/ReplayMod");
+    private final List<Runnable> delayedTasks = new ArrayList<>();
 
     @Override
     public void runTasks() {
         executor.runTasks();
+        delayedTasks.forEach(executor::send);
+        delayedTasks.clear();
     }
 
     @Override
@@ -100,15 +105,8 @@ public class SchedulerImpl implements  Scheduler {
     }
 
     private void runLater(Runnable runnable, Runnable defer) {
-        if (mc.isOnThread() && inRunLater && !inRenderTaskQueue) {
-            ((MinecraftAccessor) mc).getRenderTaskQueue().offer(() -> {
-                inRenderTaskQueue = true;
-                try {
-                    defer.run();
-                } finally {
-                    inRenderTaskQueue = false;
-                }
-            });
+        if (mc.isOnThread() && inRunLater) {
+            delayedTasks.add(defer);
         } else {
             executor.send(() -> {
                 inRunLater = true;