add option timePickerMinutes

[yk-eta]

add option timePickerMinutes to allow not to display minute in time picker

[Wernfried]

I added this feature in my fork: https://github.com/Wernfried/daterangepicker

I created a generic parameter timePickerStepSize. Just set timePickerStepSize to a value greater or equal to Duration.fromObject({hours: 1})

Default: Duration.fromObject({minutes:1})
Set the time picker step size.
Must be a luxon.Duration or number of seconds or a string according to ISO-8601 duration.
Valid values are 1,2,3,4,5,6,10,12,15,20,30 for Duration.fromObject({seconds: ...}) and Duration.fromObject({minutes: ...}) and 1,2,3,4,6,(8,12) for Duration.fromObject({hours: ...}).
Duration must be greater than minSpan and smaller than maxSpan.
For example timePickerStepSize: 600 will disable time picker seconds and time picker minutes are set to step size of 10 Minutes.
Overwrites #timePickerIncrement and #timePickerSeconds