Generate edge card connector symbols for Samtec HSEC8 with pins grouped as in layout

The Samtec HSEC8 Card Edge Connector has (for most pin-count-versions) a polarization nodge. For improved clarity between schematics and layout having this gap also visible in the connector symbol is a good thing (at least for my opinion).

I've extended the connector generator to accept an additional option pin_gap_positions, which can be used to specify that after certain numbers of pin rows an extra space should be added to be able to create groupings.

Syntax:

• No gaps: set to None

  ...    
  pin_gap_positions=None,
  ...

This is the default, also if pin_gap_positions is missing; due to line 103:

CONNECTOR.__new__.__defaults__ = (None, ) * len(CONNECTOR._fields)

it is possible to skip certain arguments.

• Identical gaps on all connectors: specify the rows where gaps should be introduced as a list

  ...    
  pin_gap_positions=[5, 10],
  ...

This creates a connector with gaps after row 5 and row 10 (in case num_rows is big enough).

• Gaps depending on the number of rows: specify a dictionary which maps num_rows to the list of gaps.

  ...    
  pin_gap_positions={ 9: [3], 13: [5] },
  ...

This creates a gap after 3 rows for the 9-row connector and after 5 rows for the 13-row connector. In case a row-count is not a member of the dictionary, there will be no gaps for this pin count.

Screenshot:

This screenshot is taken from one of the symbols generated by the merge request along with the related footprint (kicad-footprint-generator!811 (closed)):

Related merge request: kicad-symbols!3660