added deferred blocks

src/main/java/frc4388/utility/DeferredBlock.java

@@ -0,0 +1,23 @@
+package frc4388.utility;
+
+import java.util.ArrayList;
+
+public class DeferredBlock {
+    private static ArrayList<Runnable> m_blocks = new ArrayList<>();
+    private static boolean             m_hasRun = false;
+
+    public DeferredBlock(Runnable block) {
+        m_blocks.add(block);
+    }
+
+    public static void execute() {
+        if (m_hasRun) return;
+
+        for (Runnable block : m_blocks) {
+            block.run();
+        }
+
+        m_blocks.clear(); // for garbage collection
+        m_hasRun = true;
+    }
+}