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/content_sao.h

@@ -397,6 +397,7 @@ public:
 	float m_physics_override_gravity;
 	bool m_physics_override_sneak;
 	bool m_physics_override_sneak_glitch;
+	bool m_physics_override_new_move;
 	bool m_physics_override_sent;
 };