Usability improvements and minor bug fixes.

Screenshot for selected window without shadow
Support PNG, JPEG, TIFF and PDF for screenshot
Captured screenshot can send to applications:
- Clipboard
- Preview
- Mail
- Photos
Or save to locations:
- Documents
- Desktop
Turn capture sound On or Off

Universal version for both Intel and Apple chip;
Screen shot directly to email;
Bug fixes.

Take screenshot from selected Window in screen.