KoolReport 3.0.3

1. DateTimeFormat: Deal with null value or wrong format of datetime
2. Utility: Deal with null value of datetime
3. TimeBucket: Avoid null date value
4. DateTimeFormat: Check null date value and do not convert if the datetime is in good shape
5. Widget: New loading method for Widget which will allow widget is able to load resource and init itself on-demand
6. KoolReport: Able to create event handler function in the report instead of using registerEvent() function.
7. Widget: Remove registerResources() and renderResources()
8. Table: Enhance the removeDuplicate feature, supporting paging and remove duplicate cell at the same time.
   9.Node: Add function setEnded() in case we want to define a datastore with existed data and does not need data is piped to it.
9. Widget: Allow widget to initiate without creating a report to hold it, meaning you can freely create widget in your own application
10. KoolReport: Update the new way to calculate document root
11. DataStore: Allow DataStore to be used like an array, working with foreach.
12. DataStore: Add list of essential methods for array manipulation
13. DataSource: Adding static function create() to create a source without setting up a full report.
14. CSVDataSource: Allow datasource to convert string data to UTF8
15. ResourceManager: Enhance the way to public report assets folder
16. Widget: Adding onReady state to let user write custom function when widget is ready.
17. KoolReport: Adding client-side onDone() event to callback a function on all widgets are initiated.
18. Gauge: Update library library location
19. ComboChart: Adding chartType property for columns in ComboChart for setting the chart to display
20. Widget: Adding themeBase property to let theme define how widget to be rendered
21. Widget: Adding withoutLoader property to set where widget should render with or without KoolReport loader.
22. Table: Make pagnination compatible with Bootstrap4
23. Widget: Adding themeCssClass property to let theme controls appearance of widget
24. Widget: Cover widgets in custom tag to increase client-side accessibility.
25. Table: Add new feature Row Grouping which allows multi-levels row group in Table.