Added dot-matrix LCD ST7920_128x64
This is my first footprint of that kind of parts. I added the dot-matrix LCD ST7920_128x64 (https://pdf1.alldatasheet.com/datasheet-pdf/view/326219/SITRONIX/ST7920/+225_3AVPhySPPlbeZa.Hwz+/datasheet.pdf)
The manufacturer website does not provide a datasheet. I hope, I can use this link as an alternative.
The merge request for the symbol is here: kicad-symbols!3325
The datasheet does not provide a footprint. I used the drawing of shopsite selling this part.