Initial 1.3

- Non-UI related code moved to mebdd_backend and mebdd_windows
- Image data verified with MD5 sum
- mebdd queries image MD5 sums from server(s) and notifies of new
versions
- Image data may be compressed with zip (unzipped with Info-Zip)
- mebdd writes log file (mebdd_worker log file is still separate)
- Some UI changes but UI rewrite still ahead