Update space parameters in 2D and 3D

Clarified space parameters for contacts and added missing ones.

List of changes:
-Add contact bias to space parameters
-Add solver iterations to space parameters, instead of a specific
physics server function
-Renamed BODY_MAX_ALLOWED_PENETRATION to CONTACT_MAX_ALLOWED_PENETRATION
to make it consistent with other contact parameters

servers/physics_server_3d_wrap_mt.h

@@ -370,7 +370,6 @@ public:
 
 	FUNC1(free, RID);
 	FUNC1(set_active, bool);
-	FUNC1(set_collision_iterations, int);
 
 	virtual void init() override;
 	virtual void step(real_t p_step) override;