Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.Domain/Entities/Calendar/AccountCalendar.cs

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+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    public class AccountCalendar
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+
+        public Guid AccountId { get; set; }
+        public string Name { get; set; }
+        public string ColorHex { get; set; }
+        public string TimeZoneId { get; set; }
+    }
+}

Wino.Core.Domain/Entities/Calendar/Attendee.cs

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+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    public class Attendee
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+        public Guid EventId { get; set; }
+        public Guid ContactId { get; set; }
+        public AttendeeStatus Status { get; set; }
+        public bool IsOrganizer { get; set; }
+    }
+}

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

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+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    public class CalendarItem
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+        public string Title { get; set; }
+        public string Description { get; set; }
+        public string Location { get; set; }
+        public DateTimeOffset StartTime { get; set; }
+        public DateTimeOffset EndTime { get; set; }
+        public bool IsAllDay { get; set; }
+        public Guid? RecurrenceRuleId { get; set; }
+        public CalendarItemStatus Status { get; set; }
+        public CalendarItemVisibility Visibility { get; set; }
+        public DateTimeOffset CreatedAt { get; set; }
+        public DateTimeOffset UpdatedAt { get; set; }
+        public Guid CalendarId { get; set; }
+    }
+}

Wino.Core.Domain/Entities/Calendar/RecurrenceRule.cs

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+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    public class RecurrenceRule
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+
+        public Guid CalendarItemId { get; set; }
+        public CalendarItemRecurrenceFrequency Frequency { get; set; }
+        public int Interval { get; set; }
+        public string DaysOfWeek { get; set; }
+        public DateTimeOffset StartDate { get; set; }
+        public DateTimeOffset EndDate { get; set; }
+        public int Occurrences { get; set; }
+    }
+}

Wino.Core.Domain/Entities/Calendar/Reminder.cs

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+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar
+{
+    public class Reminder
+    {
+        [PrimaryKey]
+        public Guid Id { get; set; }
+        public Guid CalendarItemId { get; set; }
+
+        public DateTimeOffset ReminderTime { get; set; }
+        public CalendarItemReminderType ReminderType { get; set; }
+    }
+}