Add "final" marker to a number of classes

Devirtualization is an optimization in the generated assembly: when a
class C is polymorphic but also final, ``((C *)ptr)->func()`` can be
turned from an indirect into a static call.

scripts/CellTestLevel.cpp

@@ -64,7 +64,7 @@ public:
   virtual int16_t CallEvent(int event, tOSIRISEventInfo *data);
 };
 
-class LevelScript_0000 : public BaseScript {
+class LevelScript_0000 final : public BaseScript {
 public:
   int16_t CallEvent(int event, tOSIRISEventInfo *data);
 };