Add Hirose FH26 series script

Hirose FH26 series FPC/FFC connectors generator script (based on conn_ffc_molex_502250.py script).

Generated footprints looks like this (examples for 15-pin):

The series datasheet:

https://www.hirose.com/en/product/document?clcode=&productname=&series=FH26&documenttype=Catalog&lang=en&documentid=D49355_en

https://www.mouser.com/datasheet/2/185/FH26_catalog-939414.pdf

FH26 series doesn't have 19-pin connector. FH26W series doesn't have 55-pin connector.

This script includes both connectors. FH26W is a halogen-free version of FH26, but the same mechanical dimensions.

Footprints: kicad-footprints!3137 (closed)

3D models: kicad-packages3D!889 (merged)

3D models FreeCAD parametric source file: kicad-packages3D-source!369 (merged)