Use sendMultipartTextMessage for respond with sms

Long messages won't send properly if used in the respond-with-sms API.
Use sendMultipartTextMessage to get around this. Also display an error
toast if the message didn't send properly.

Bug: 65087120
Test: manual
Change-Id: I31ba24a0600e42010752b1216b1aca7d1098b319
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 9202e74..b17c6f3 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -21,6 +21,8 @@
         android:sharedUserId="android.uid.system">
 
     <protected-broadcast android:name="android.intent.action.SHOW_MISSED_CALLS_NOTIFICATION" />
+    <protected-broadcast android:name="com.android.server.telecom.MESSAGE_SENT" />
+
 
     <!-- Prevents the activity manager from delaying any activity-start
          requests by this package, including requests immediately after