Add footprint for Trinamic TMC2226-SA
Footprint dimensions: https://www.trinamic.com/fileadmin/assets/Support/AppNotes/AN005x-IC_Package_PCB_Footprint_Guidelines_HTSSOP28_rev1.00.pdf
Component: https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2226_datasheet_rev1.10.pdf
Footprint: kicad-footprints!3230 (merged)
Symbol: kicad-symbols!3968 (merged)
Edited by Gonçalo Pereira