Implement new RobotContainer.java and Constants.java Classes

- OI.java has been deprecated and replaced with RobotContainer.java
- RobotMap.java has been deprecated and replaced with Constants.java
- Changes have been made to use the new classes without errors; some of these changes will be changed in the future

src/main/java/frc4388/robot/Constants.java

@@ -0,0 +1,34 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018-2019 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+package frc4388.robot;
+
+/**
+ * The Constants class provides a convenient place for teams to hold robot-wide numerical or boolean
+ * constants.  This class should not be used for any other purpose.  All constants should be
+ * declared globally (i.e. public static).  Do not put anything functional in this class.
+ *
+ * <p>It is advised to statically import this class (or one of its inner classes) wherever the
+ * constants are needed, to reduce verbosity.
+ */
+public final class Constants {
+    public static final class DriveConstants {
+        public static final int DRIVE_LEFT_FRONT_CAN_ID = 2;
+        public static final int DRIVE_RIGHT_FRONT_CAN_ID = 4;
+	    public static final int DRIVE_LEFT_BACK_CAN_ID = 3;
+	    public static final int DRIVE_RIGHT_BACK_CAN_ID = 5;
+    }
+
+    public static final class LEDConstants {
+        public static final int LED_SPARK_ID = 0;
+    }
+
+    public static final class OIConstants {
+        public static final int XBOX_DRIVER_ID = 0;
+        public static final int XBOX_OPERATOR_ID = 1;
+    }
+}