Custom Interval Timer: Workout

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(1.0.20)
+ Created a Timers area that lists all your timers.
+ Redesigned the previous Timers area (now called Timer Editor area).
+ Ability to copy timers.
+ Ability to undo deletion of timers.
+ Option to show the upcoming interval in the Countdown area.
+ Added more details in the Help dialog.
+ Added a confirmation dialog after clicking on the MATH Domain Development logo.
+ Minor layout changes.