Split Locomotor trait from Mobile

Add GrantConditionOn*Layer traits

This allows to
- drop some booleans from Locomotor
- drop a good part of the subterranean- and jumpjet-specific code/hacks from Mobile
- grant more than 1 condition per layer type (via multiple traits)
- easily add more traits of this kind for other layers

OpenRA.Mods.Common/Activities/Move/Move.cs

@@ -51,7 +51,7 @@ namespace OpenRA.Mods.Common.Activities
 			{
 				List<CPos> path;
 				using (var search =
-					PathSearch.FromPoint(self.World, mobile.Info, self, mobile.ToCell, destination, false)
+					PathSearch.FromPoint(self.World, mobile.Info.LocomotorInfo, self, mobile.ToCell, destination, false)
 					.WithoutLaneBias())
 					path = self.World.WorldActor.Trait<IPathFinder>().FindPath(search);
 				return path;
@@ -293,7 +293,9 @@ namespace OpenRA.Mods.Common.Activities
 				// Wait a bit to see if they leave
 				if (!hasWaited)
 				{
-					waitTicksRemaining = mobile.Info.WaitAverage + self.World.SharedRandom.Next(-mobile.Info.WaitSpread, mobile.Info.WaitSpread);
+					waitTicksRemaining = mobile.Info.LocomotorInfo.WaitAverage
+						+ self.World.SharedRandom.Next(-mobile.Info.LocomotorInfo.WaitSpread, mobile.Info.LocomotorInfo.WaitSpread);
+
 					hasWaited = true;
 				}