Timer4TM

Invalid date

- Report export to SD card upgraded to Share via clipboard, file folder, email, spreadsheet apps, etc.
- Support asking for permission to write to Documents folder on Android 6.0+
- Clarify that grace time applies even when Show Grace marks not enabled
- Auto-convert extra seconds to minutes when using time adjustment pop-up window
- Avoid app crash on unexpectedly large numbers while editing a timer
- Link 'About App' in Settings directly to app support page
- Additional visual improvements