Shift - obd2 ver. 1.81 fixes

Here's what's included in the update:

- fixed bug that caused crash when running in 3 gauge mode.
- user gauge visual preferences are stored.
- dual sensor plotting: You can track two sensors in landscape mode and record
- Users can record two sensors at the same time.(Sensor logger add-on required).

Here's a screenshot of dual sensor plotting

If you guys spot any bugs leave a comment.
Thanks.