Ver. 1.70 Custom PID support and more

Here's what will be included in the next update (1.70)

- Custom enhanced PID support. (In-app purchase)
- Freeze frame support (mode 02)
- Added new DTC descriptions.
- Fixed bug that caused sensor logging mail view not to close after mailing file.
- Fixed sensor logger file name which displayed incorrectly.
- Grid-gauge performance fix.