- cleaned up switch code and fixed several problems:

* savegames stored an index in the switch table and performed no validation when loading a savegame.
  * setting of a random switch animation duration was broken.
  * separated the 2 values stored in the Time variable into 2 separate variables.
  * defining a switch with one texture already belonging to another switch could leave broken definitions in the switch table.
- added function for serializing switch and door animation pointers.
- bumped min. savegame versions due to changes to DButtonThinker and removed all current savegame compatibility code.


SVN r3030 (trunk)

src/r_interpolate.cpp

@@ -826,16 +826,7 @@ void DPolyobjInterpolation::Serialize(FArchive &arc)
 	arc << po << oldverts;
 	poly = polyobjs + po;
 
-	if (SaveVersion >= 2448) 
-	{
-		arc << oldcx << oldcy;
-	}
-	else
-	{
-		// This will glitch if an old savegame is loaded but at least it'll allow loading it.
-		oldcx = poly->CenterSpot.x;
-		oldcy = poly->CenterSpot.y;
-	}
+	arc << oldcx << oldcy;
 	if (arc.IsLoading()) bakverts.Resize(oldverts.Size());
 }