[TIMOB-18918] Windows: Implement Ti.Calendar.Alert

http://docs.appcelerator.com/platform/latest/#!/api/Titanium.Calendar.Alert https://msdn.microsoft.com/en-us/library/windows/apps/xaml/dn631243.aspx https://msdn.microsoft.com/en-us/library/windows/apps/windows.applicationmodel.appointments.aspx

Properties

- absoluteDate : Date The absolute date for the alarm. - alarmTime : Date READONLY Date/time at which this alert alarm is set to trigger. - begin : Date READONLY Start date/time for the corresponding event. - end : Date READONLY End date/time for the corresponding event. - eventId : Number READONLY Identifier of the event for which this alert is set. - id : String READONLY Identifier of this alert. - minutes : Number READONLY Reminder notice period in minutes, that determines how long prior to the event this alert should trigger. - relativeOffset : Number The offset from the start of an event, at which the alarm fires. - state : Number READONLY The current state of the alert. ...