Stabilization for iOS 12

Mil Fuel Check v 2.1
-With v 2.1 we swapped Army Fuel Check's name over to Mil Fuel Check to better support our customers!
-Continued support for as many airframes as possible
-Under the hood optimizations

New to Army Fuel Check v 2.0 -
-Adjustable Reserve 1/2 times instead of VFR/IFR reserves (default to 20/30 minutes respectively)
-Adjustable bingo fuel (defaults to 400 lbs)
-Adjustable notification times (defaults to 15 minutes)
-Switch between Green/Black UIs
-Adjustable external tank fuel settings