CMB-590: Clock - update design to match System clock

the clock component updated to match the system clock.
1. date has been removed from the clock component. all the functions related to date has been removed.
2. new css class 'moon-clock-top-text' applied to change the clock style.
3. the time format is retained and the format will change according to the selected locale.
4. in system clock, meridian text shows in capital letters but clock will shows the meridian text as per the ilib format. 
If this control will always have the `mini` class, let's add it to the component definition above rather than trying to dynamically add it here.