Sneak: Add option for old move code

Temporary option for the old move code for specific old sneak behaviour.
Enabled by setting the added 'new move' physics override to false.
By default 'new move' is true.

src/script/lua_api/l_object.h

@@ -105,7 +105,7 @@ class ObjectRef : public ModApiBase {
 	static int l_get_armor_groups(lua_State *L);
 
 	// set_physics_override(self, physics_override_speed, physics_override_jump,
-	//                      physics_override_gravity, sneak, sneak_glitch)
+	//                      physics_override_gravity, sneak, sneak_glitch, new_move)
 	static int l_set_physics_override(lua_State *L);
 
 	// get_physics_override(self)