Timestamp Camera Enterprise

Oct 20, 2018

- Improve compatibility and stability
- Support place the "toggle camera button" at the bottom
- Set the logo to the same margin as the text
- Improve transistor font
- Support more file name formats
- Remember the exposure value
- Support "send email immediately after taking a photo"
- Add DateTimeOriginal and DateTimeDigitized to the image's EXIF
- Support "Timestamp margin suitable for printing"