Parse recipients from RESPOND_VIA_MESSAGE correctly

UriUtil#parseRecipientsFromSmsMmsUri() will returns a comma-separated
recipients for common use so that InsertNewMessageAction#createMessage()
can create or get a conversation correctly for RESPOND_VIA_MESSAGE.
In addition, mms/mmsto schemes are added. And it includes small cleanup
intent-filters for LaunchConversationActivity.

Test: adb shell am startservice
-a android.intent.action.RESPOND_VIA_MESSAGE -d "sms:12345678,87654321"
-e android.intent.extra.TEXT "Text"

Change-Id: I291dc765a46846982d059016d44f90873c687867
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>

src/com/android/messaging/util/UriUtil.java

@@ -324,14 +324,13 @@ public class UriUtil {
     }
 
     /**
-     * Extract recipient destinations from Uri of form
-     *     SCHEME:destionation[,destination]?otherstuff
+     * Extract recipient destinations from Uri of form SCHEME:destination[,destination]?otherstuff
      * where SCHEME is one of the supported sms/mms schemes.
      *
      * @param uri sms/mms uri
-     * @return recipient destinations or null
+     * @return a comma-separated list of recipient destinations or null.
      */
-    public static String[] parseRecipientsFromSmsMmsUri(final Uri uri) {
+    public static String parseRecipientsFromSmsMmsUri(final Uri uri) {
         if (!isSmsMmsUri(uri)) {
             return null;
         }
@@ -341,7 +340,7 @@ public class UriUtil {
         }
         // replaceUnicodeDigits will replace digits typed in other languages (i.e. Egyptian) with
         // the usual ascii equivalents.
-        return TextUtil.replaceUnicodeDigits(parts[0]).replace(';', ',').split(",");
+        return TextUtil.replaceUnicodeDigits(parts[0]).replace(';', ',');
     }
 
     /**