Core Advantage Interval Timer

Updates: **Version 2.1.0*** - Introducing a training metronome! This is a key tool that we often use in the gym for improving running and cycling cadence or building rhythm and coordination on movements. Set up a duration for the timer then pick a cadence, you can even adjust the tempo from within the timer. - A little styling change here and there, with some streamlined button sizes and font adjustments - Added titles to the top of each page and shortened up the menu item names for slick-ness