WebViewer: Add calender picker for date report parameter

[speckyspooky]

According to an older request #939 to add a "dade picker" I plan an implementation based on the HTML5
to add the option of the types "date", "datetime-local" and "time" to the parameter-dialog.

The plan is to use the standard behavior of the browser based on the input-tag.
Therefore the display of the datepicker is dependent on the browser-implementation. The browser Chrome & Edge (Chromium based) will have the best support by standard (without additional libraries). The browser FirFox will sho only the date-picker without support of datetime- and time-picker.

But it will be a good improvement and we will also be able to add a better date-picker-library later in a next step.

The plan is not to change the JSP-fragment by default. The better way is that we will have new options on eclipse-dialog of the parameters based on the data type to select an additional kind of display "Display As".

Plan of eclipse-dialog

Date-Picker, pilot implementation displayed on Chrome

[claesrosell]

@speckyspooky I have an "almost done" implementation of this that I have not pushed. What is left is support for jsp-fragments, some exception regarding context initialization from Jetty.
Would you be interested in this?

[speckyspooky]

@claesrosell
Yes, I'm interested on it, so I can compare it with my version.
I have done my implementation through the whole parameter line and do currently some advanced tests.

[claesrosell]

Here is a link to my branch : https://github.com/claesrosell/birt/tree/926-calender-picker-for-date-report-parameter
It is not rebased against master.

[speckyspooky]

@claesrosell
I reviewed your changes and there is a main difference to my version.
You have defined a new display type for the parameter "DATE_CTRL".
My version instead is based on new "Display As"-style type and the display type keeps a textbox.
With the display-style I handle all version of date, datetime, time and the according options of only date w/ or w/o time picker and the version of short or long time picker.

I would prefer the "Display As"-version. Do you thought about this way?

[claesrosell]

No, I did not consider that. I do not have a preferred way of solving this. I just tried to mimic how other controls were implemented.

[speckyspooky]

The enhancement was merged with #1359