Modifying SMSHelper.Message class and PACKET_TYPE_SMS_MESSAGE to contain list of attachment objects.

src/org/kde/kdeconnect/Plugins/SMSPlugin/SMSPlugin.java

@@ -113,6 +113,16 @@ public class SMSPlugin extends Plugin {
      *                 // If this value is not defined or if it does not match a valid subscriber_id known by
      *                 // Android, we will use whatever subscriber ID Android gives us as the default
      *
+     * "attachments": <List<Attachment>>    // List of Attachment objects, one for each attached file in the message.
+     *
+     * An Attachment object looks like:
+     * {
+     *     "part_id": <long>                // part_id of the attachment used to read the file from MMS database
+     *     "mime_type": <int>               // contains the mime type of the file (image, video, audio, etc.)
+     *     "encoded_thumbnail": <String>    // Optional base64-encoded thumbnail preview of the content for types which support it
+     *     "unique_identifier": <String>    // Unique name of te file
+     * }
+     *
      * An Address object looks like:
      * {
      *     "address": <String> // Address (phone number, email address, etc.) of this object