Added opmodes to start/stop TACNET service, sync.

FtcRobotController/src/main/java/org/firstinspires/ftc/robotcontroller/external/samples/sample_conventions.md

@@ -55,7 +55,7 @@ becomes obsolete.
 ### Device Configuration Names
 
 The following device names are used in the external samples
-
+ 
 ** Motors:
 left_drive
 right_drive
@@ -82,7 +82,7 @@ digout
 ** Localization:
 compass
 gyro
-imu
+imu 
 navx
 
 ### Device Object Names

FtcRobotController/src/main/java/org/firstinspires/ftc/robotcontroller/internal/FtcRobotControllerActivity.java

@@ -183,6 +183,11 @@ public class FtcRobotControllerActivity extends Activity
 
   private WifiDirectChannelChanger wifiDirectChannelChanger;
 
+  private static FtcRobotControllerActivity appActivity;
+  public static FtcRobotControllerActivity getAppActivity() {
+    return appActivity;
+  }
+
   protected class RobotRestarter implements Restarter {
 
     public void requestRestart() {
@@ -267,6 +272,7 @@ public class FtcRobotControllerActivity extends Activity
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
+    appActivity = this;
     super.onCreate(savedInstanceState);
 
     if (enforcePermissionValidator()) {