feat(track): 3D sleepers and switch timbers, blade heel and throw from templates, one rail carving pass

- sleepers3d / sleepers3dplain / sleepers3dbed in eu07.ini: timbers put together from the begin, main and end parts of a model
  and stretched to their length, plain sleepers of their own model; tracks whose plain sleepers would touch are laid as one
  cluster, lines of timbers led by priority and turned to the bisectors of frogs and crossings at a limited rate, whole timbers
  under crossings, split ones between tracks with room to part them, gaps filled per rail and overlaps shortened or dropped;
  clusters worked out in a background thread while driving, on demand in the editor
- the ballast can be left out under the beams (sleepers3dbed no)
- blades get their heel and throw from the switch template or blades <heel> <throw> in the scenery; blades of double switches
  run on into the track linking them to the next switch
- rail cutting at frogs, wing rails, movable noses and switch crossings done by one carving pass (RailCarve)
- tint of the rail treads applied to the colour only, without the matte band at the frog
- a switch trailed through with a movable nose set the other way derails the vehicle
- self-tests: sleepercheck, sharedzones, beamsnear, throw, sleepersbg

McZapkie/Mover.cpp

@@ -1346,6 +1346,8 @@ void TMoverParameters::Derail(DerailReason const Reason)
 			ErrorLog("Bad dynamic: " + Name + " derailed due to wrong track type"); // błąd w scenerii
 		else if (Reason == COLLISION)
 			WriteLog("Bad driving: " + Name + " derailed"); // This reason also generates its own message in `TMoverParameters::CollisionDetect()`
+		else if (Reason == TRAILED_SWITCH)
+			ErrorLog("Bad driving: " + Name + " derailed trailing through a switch with a movable nose set the other way");
 	}
 }