Make repairing buildings and units grant experience

Using the repair button and repair pad, not using engineers and mechanics.

OpenRA.Mods.Common/Activities/Repair.cs

@@ -49,6 +49,13 @@ namespace OpenRA.Mods.Common.Activities
 
 			if (health.DamageState == DamageState.Undamaged)
 			{
+				if (host.Owner != self.Owner)
+				{
+					var exp = host.Owner.PlayerActor.TraitOrDefault<PlayerExperience>();
+					if (exp != null)
+						exp.GiveExperience(repairsUnits.PlayerExperience);
+				}
+
 				Game.Sound.PlayNotification(self.World.Map.Rules, self.Owner, "Speech", repairsUnits.FinishRepairingNotification, self.Owner.Faction.InternalName);
 				return NextActivity;
 			}

OpenRA.Mods.Common/Traits/Buildings/RepairableBuilding.cs

@@ -35,6 +35,9 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Suffixed by the internal repairing player name.")]
 		public readonly string IndicatorPalettePrefix = "player";
 
+		[Desc("Experience gained by a player for repairing structures of allied players.")]
+		public readonly int PlayerExperience = 0;
+
 		public override object Create(ActorInitializer init) { return new RepairableBuilding(init.Self, this); }
 	}
 
@@ -133,6 +136,16 @@ namespace OpenRA.Mods.Common.Traits
 
 				if (health.DamageState == DamageState.Undamaged)
 				{
+					Repairers.Do(r =>
+					{
+						if (r == self.Owner)
+							return;
+
+						var exp = r.PlayerActor.TraitOrDefault<PlayerExperience>();
+						if (exp != null)
+							exp.GiveExperience(Info.PlayerExperience);
+					});
+
 					Repairers.Clear();
 					RepairActive = false;
 					return;

OpenRA.Mods.Common/Traits/Buildings/RepairsUnits.cs

@@ -27,6 +27,9 @@ namespace OpenRA.Mods.Common.Traits
 
 		[Desc("The sound played when repairing a unit is done.")]
 		public readonly string FinishRepairingNotification = null;
+
+		[Desc("Experience gained by the player owning this actor for repairing an allied unit.")]
+		public readonly int PlayerExperience = 0;
 	}
 
 	public class RepairsUnits { }