CMB-825: Duration Picker (hour, minute, second)

Duration Picker Widget is completed and uploaded. countdown feature is implemented.
please review the code 
You can convert these to simpler "falsy" checks to improve preformance and readability. `if (!this.valueHour) {`. Essentially, we always want to try for basic "truthy" checks, since they preform better in JavaScript, then toward `==` comparisons, and in very very rare occasions do `===`, but only when absolutely necessary. JavaScript has to check the value and the type in these checks and it's a little slower. This is backwards from how other compiled languages work.