Rename fields on Repairable traits

To bring them in line with RearmActors,
Repairable.RepairBuildings and
RepairableNear.Buildings have been renamed
to RepairActors.
Additionally, their RA-specific internal
defaults were removed and the FieldLoader
now requires them to be set explicitly.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -88,7 +88,6 @@ namespace OpenRA.Mods.Common.UpdateRules
 
 			new UpdatePath("release-20181215", "playtest-20190106", new UpdateRule[]
 			{
-				// Bleed only changes here
 				new AddCarryableHarvester(),
 				new RenameEditorTilesetFilter(),
 				new DefineNotificationDefaults(),
@@ -117,8 +116,10 @@ namespace OpenRA.Mods.Common.UpdateRules
 
 			new UpdatePath("playtest-20190106", new UpdateRule[]
 			{
+				// Bleed only changes here
 				new RemoveAttackSuicides(),
 				new MakeMobilePausableConditional(),
+				new StreamlineRepairableTraits(),
 			})
 		};