PCB-DXF-HID Data Structures

Here are the data structures with brief descriptions:

_DxfList	List with pcb element header data
_StringList	List with string data
Aperture	Aperture properties
Apertures	List of apertures
DxfPendingDrills	Drill (hole) properties
hid_gc_struct	Definition of graphic context for the dxf HID

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