Add newly scripted PLCC footprints. (landing pattern IPC, dimension microsemi)
This adds another patch of footprints needed for KiCad/kicad-symbols#534
These are scripted: pointhi/kicad-footprint-generator#125 The dimensions are derived via the formulas outlined in ipc documents.
Dimensions from http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095 page 50
I choose to use the current naming convention for the new PLCC footprints. I will delete the old footprints later. (will need another update to many symbol libs.)
The pads are slightly smaller in all new footprints compared to the old footprints: