Version 2.0.0 Pre-Release 2

This is a major rewrite of the message import / export code that switches the format from a single (standard) JSON file, with embedded Base64 encoded MMS binary data, to a ZIP file containing a Newline-delimited JSON (NDJSON) file ('messages.ndjson'), containing message metadata and text data, and a 'data' directory, containing the untouched binary files stored natively by Android.

For further discussion, see here and here.