New input property to always show allDay row

[Morphclue]

Is your feature request related to a problem? Please describe
The cal-day-columns is only shown, when an allDay: true event exists.

Describe the solution you'd like
A new Input property for a calendar, e.g.:

<mwl-calendar-week-view>
    [allDayEvents]="true"
</mwl-calendar-week-view>

Describe your use case for implementing this feature
As a user I would like to have the possibility to add allDay events in the calendar without a previously existing allDay event and without an extra button. A click on the cal-day-columns should create an allDay event for me.

[matts-bot]

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