Scripted sop-4 and sop-18 footpritns

No changes to symbols needed. (The footprint that got renamed is not currently used by any symbol)

script: https://github.com/pointhi/kicad-footprint-generator/pull/289

http://www.ixysic.com/home/pdfs.nsf/www/CPC1017N.pdf/$file/CPC1017N.pdf

SOP-4_3.8x4.1mm_P2.54mm:
  size_source: 'http://www.ixysic.com/home/pdfs.nsf/www/CPC1017N.pdf/$file/CPC1017N.pdf'
  body_size_x:
    nominal: 3.8 #rounded to avoid changing the symbol
    tolerance: 0.025
  body_size_y:
    nominal: 4.1 #rounded to avoid changing the symbol
    tolerance: 0.025
  body_height:
    # calculated from (2.03 +/-0.025) + (0.64 +/-0.04)
    nominal: 2.094
    tolerance: 0.047

  overall_size_x:
    nominal: 6.096
    tolerance: 0.102
  lead_width:
    nominal: 0.381
    tolerance: 0 # not given
  lead_len:
    nominal: 0.559
    tolerance: 0.127

  pitch: 2.54
  num_pins_x: 0
  num_pins_y: 2

---

https://toshiba.semicon-storage.com/info/docget.jsp?did=30523

SOP-18_7.0x12.5mm_P1.27mm:
  size_source: 'https://toshiba.semicon-storage.com/info/docget.jsp?did=30523'
  body_size_x:
    nominal: 7
    tolerance: 0.2
  body_size_y:
    nominal: 12.5
    tolerance: 0.2
  body_height:
    maximum: 2.45

  overall_size_x:
    nominal: 10.3
    tolerance: 0.3
  lead_width:
    nominal: 0.4
    tolerance: 0.1
  lead_len:
    nominal: 0.7
    tolerance: 0.2

  pitch: 1.27
  num_pins_x: 0
  num_pins_y: 9