Various updates and improvements

Updated for iOS18.

Updated for iOS 15.

Updated for iOS 12.1

Added HealthKit integration.
Updated for iOS 12.

Bug fixes.

Bug fixes.

Updated for iOS 11.

Code update.

Improved displays.

Improved error checking.

Many improvements, including iCloud backup, ability to add previous workouts, and additional language support.

Updated for iOS 7.

Updated displays for iPhone5.

Added options for a one-second cadence timer and a programable-length interval beep to assist in set timing.
"De-bounced" Stop button by requiring a return to the previous screen to restart the timer.

Added recording of the total workout time, and calculation of the average rest period between exercises.

Option to record notes for each workout session.

The ability to reorder exercises.
The option to record reps for each exercise set.
A label and workout dates on the graph's x-axis.

Fixed a bug where the performance view table cell was not always deselected upon return from the performance graph.
Changed the deployment target to iOS 3.0.