Support AddSpecificDates method of ScheduleRule

[DavidGoldwasser]

Enhancement Request

If a model has used AddSpecificDates with the API the OpenStudio Application calendar correctly shows the, but currently there is no method to alter these dates in the GUI; just a start/end date for a rule.

Detailed Description

With more time series calibration schedule rules that accord and a number of non-adjacent dates will be used more often, for example a kiln schedule for a school. Newly added support for holidays helps address one common use case, but it would still be nice to have support in GUI for a number of non-holiday non-adjacent dates.

Possible Implementation

• One solution could be to have an input field that takes comma separated dates, but that could be problematic for user.
• A clean solution for the modeler would be to make the annual color coded calendar view editable where users could select dates they want to rule to apply to.
• A kind of ugly solution could be to have "add a date button" button that pops up a date input to add a enable/disable a single date at a time, then this would be called multiple times