Add order types

MultiversalDiplomacy/Orders/BuildOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order to build a unit.
+/// </summary>
+public class BuildOrder : Order
+{
+    /// <summary>
+    /// The location in which to build the unit.
+    /// </summary>
+    public Location Location { get; }
+
+    /// <summary>
+    /// The type of unit to build.
+    /// </summary>
+    public UnitType Type { get; }
+
+    public BuildOrder(Power power, Location location, UnitType type)
+        : base (power)
+    {
+        this.Location = location;
+        this.Type = type;
+    }
+}

MultiversalDiplomacy/Orders/ConvoyOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order to move another unit via convoy.
+/// </summary>
+public class ConvoyOrder : UnitOrder
+{
+    /// <summary>
+    /// The unit to convoy.
+    /// </summary>
+    public Unit Target { get; }
+
+    /// <summary>
+    /// The destination season to which the target is moving.
+    /// </summary>
+    public Season Season { get; }
+
+    /// <summary>
+    /// The destination location to which the target is moving.
+    /// </summary>
+    public Location Location { get; }
+
+    public ConvoyOrder(Power power, Unit unit, Unit target, Season season, Location location)
+        : base (power, unit)
+    {
+        this.Target = target;
+        this.Season = season;
+        this.Location = location;
+    }
+}

MultiversalDiplomacy/Orders/DisbandOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order to disband a unit.
+/// </summary>
+public class DisbandOrder : UnitOrder
+{
+    public DisbandOrder(Power power, Unit unit)
+        : base (power, unit) {}
+}

MultiversalDiplomacy/Orders/HoldOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order for a unit to hold its current province.
+/// </summary>
+public class HoldOrder : UnitOrder
+{
+    public HoldOrder(Power power, Unit unit)
+        : base (power, unit) {}
+}

MultiversalDiplomacy/Orders/MoveOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order for a unit to move to another province.
+/// </summary>
+public class MoveOrder : UnitOrder
+{
+    /// <summary>
+    /// The destination season to which the unit should move.
+    /// </summary>
+    public Season Season { get; }
+
+    /// <summary>
+    /// The destination location to which the unit should move.
+    /// </summary>
+    public Location Location { get; }
+
+    public MoveOrder(Power power, Unit unit, Season season, Location location)
+        : base (power, unit)
+    {
+        this.Season = season;
+        this.Location = location;
+    }
+}

MultiversalDiplomacy/Orders/RetreatOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order for a dislodged unit to retreat to an adjacent province.
+/// </summary>
+public class RetreatOrder : UnitOrder
+{
+    /// <summary>
+    /// The destination location to which the unit should retreat.
+    /// </summary>
+    public Location Location { get; }
+
+    public RetreatOrder(Power power, Unit unit, Location location)
+        : base (power, unit)
+    {
+        this.Location = location;
+    }
+}

MultiversalDiplomacy/Orders/SupportHoldOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order for a unit to support another unit's hold order.
+/// </summary>
+public class SupportHoldOrder : UnitOrder
+{
+    /// <summary>
+    /// The unit to support.
+    /// </summary>
+    public Unit Target { get; }
+
+    public SupportHoldOrder(Power power, Unit unit, Unit target)
+        : base (power, unit)
+    {
+        this.Target = target;
+    }
+}

MultiversalDiplomacy/Orders/SupportMoveOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order for a unit to support another unit's move order.
+/// </summary>
+public class SupportMoveOrder : UnitOrder
+{
+    /// <summary>
+    /// The unit to support.
+    /// </summary>
+    public Unit Target { get; }
+
+    /// <summary>
+    /// The destination season to which the target is moving.
+    /// </summary>
+    public Season Season { get; }
+
+    /// <summary>
+    /// The destination location to which the target is moving.
+    /// </summary>
+    public Location Location { get; }
+
+    public SupportMoveOrder(Power power, Unit unit, Unit target, Season season, Location location)
+        : base (power, unit)
+    {
+        this.Target = target;
+        this.Season = season;
+        this.Location = location;
+    }
+}

MultiversalDiplomacy/Orders/SustainOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order to sustain a timeline in existence.
+/// </summary>
+public class SustainOrder : Order
+{
+    /// <summary>
+    /// The ordered time center.
+    /// </summary>
+    public Location TimeCenter { get; }
+
+    /// <summary>
+    /// The timeline to sustain.
+    /// </summary>
+    public int Timeline { get; }
+
+    public SustainOrder(Power power, Location timeCenter, int timeline)
+        : base (power)
+    {
+        this.TimeCenter = timeCenter;
+        this.Timeline = timeline;
+    }
+}

MultiversalDiplomacy/Orders/UnitOrder.cs

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+using MultiversalDiplomacy.Model;
+
+namespace MultiversalDiplomacy.Orders;
+
+/// <summary>
+/// An order given to a specific unit.
+/// </summary>
+public abstract class UnitOrder : Order
+{
+    /// <summary>
+    /// The ordered unit.
+    /// </summary>
+    public Unit Unit { get; }
+
+    public UnitOrder(Power power, Unit unit) : base(power)
+    {
+        this.Unit = unit;
+    }
+}