Enh. Suggestions for sap.m.PlanningCalendar

OpenUI5 version: 1:36.0

I have been working on an extension of the PlanningCalendar, below are some the changes i have made which i think could be included. All changes came from customer feature requests. I would make a PR but guessing some changes already in pipeline.

1. SubIntervals can be set on the PlanningCalendarView but not directly on the PlanningCalendar, customer wants to see intervals every 15 minutes when on hour view
2. Min and Max dates, customer wants to control how far into the past and future users can go
3. EndDate, needed for Selecting Data for the current view, need to be able to determine both the StartDate and the EndDate
   eg

 SELECT * FROM Appointments WHERE Start < EndDate AND End > StartDate 

example code

  metadata: {
         properties: {
              minDate: { type: "object", group: "Data" },
              maxDate: { type: "object", group: "Data" },
              showSubIntervals: { type: "boolean", group: "Appearance", defaultValue: false}

   ....

              PlanningCalendar.prototype.setViewKey = function(sKey) {
               ..
                oView.setShowSubIntervals(this.getShowSubIntervals()); //1  a getView would be nice

                if (this.getMinDate() &&  this._oTimeInterval) {  //2
                    this._oTimeInterval._oMinDate = new UniversalDate(this.getMinDate());
                }

                if (this.getMaxDate() && this._oTimeInterval) { //2
                    this._oTimeInterval._oMaxDate = new UniversalDate(this.getMaxDate());
                }     
            },
...
            PlanningCalendar.prototype.getRowEndDate = function() {
                // this._iRowSize = oCalendarRow._iRowSize; - derived @ onBeforeRendering
                return new Date(this.getStartDate().getTime() + this._iRowSize);  //3
            },