Interface: TapeGeometry

Per-head-family geometry on BrotherQLMedia.

Brother's PT-P / PT-E line ships two head families with different per-tape pin layouts. The same TZe id maps to different printableDots / leftMarginPins / rightMarginPins values on a 128-pin head (PT-E550W, PT-P750W) versus a 560-pin head (PT-P900, P900W, P950NW, P910BT). DK media leaves these unset and resolves via the flat fields on BrotherQLMedia directly.