Refactored Node3D rotation modes

* Made the Basis euler orders indexed via enum.
* Node3D has a new rotation_order property to choose Euler rotation order.
* Node3D has also a rotation_mode property to choose between Euler, Quaternion and Basis

Exposing these modes as well as the order makes Godot a lot friendlier for animators, which can choose the best way to interpolate rotations.
The new *Basis* mode makes the (exposed) transform property obsolete, so it was removed (can still be accessed by code of course).

scene/3d/reflection_probe.cpp

@@ -188,6 +188,7 @@ void ReflectionProbe::_validate_property(PropertyInfo &property) const {
 			property.usage = PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL;
 		}
 	}
+	VisualInstance3D::_validate_property(property);
 }
 
 void ReflectionProbe::_bind_methods() {