added read-only access to pin direction and subcategory object #639
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When analyzing a graph node's pins, it's really helpful to know which direction the pin is, so this patch adds read support via pin.direction.
Also, I found that many pins in existing BPs that have a structure for their type have category = 'struct' but sub_category=None, default_object=None, etc. - there's no good way (that I could find at least) to programmatically figure out the pin's structure type.
In the debugger, however, I noticed that the structure is available via pin.PinType.PinSubCategoryObject, so this patch also exposes read access to that as pin.sub_category_object.