EMAILPLT-87

- Adjusting the attachment image to no longer overlap Subject text
- The header images now line up with the row images
- Adjusting Demo class to correctly set the multipart and answered flags from sample json files
- Adjusted the Demo jsons to return a combination of the multipart and answered flags to be able to visually test the image locations
- Headers in Safari are still very close together, so this is just a partial fix to EMAILPLT-87