Scripted version of LQFP-208 and LQFP-216

Script PR: https://github.com/pointhi/kicad-footprint-generator/pull/245

LQFP-208_28x28mm_P0.5mm:

datasheet: https://www.nxp.com/docs/en/package-information/SOT459-1.pdf

LQFP-208_28x28mm_P0.5mm:
  size_source: 'https://www.nxp.com/docs/en/package-information/SOT459-1.pdf'
  body_size_x:
    minimum: 27.9
    maximum: 28.1
  body_size_y:
    minimum: 27.9
    maximum: 28.1
  overall_size_x:
    minimum: 29.85
    maximum: 30.15
  overall_size_y:
    minimum: 29.85
    maximum: 30.15
  lead_width:
    minimum: 0.17
    maximum: 0.27
  lead_len:
    minimum: 0.45
    maximum: 0.75
  pitch: 0.5
  num_pins_x: 52
  num_pins_y: 52

LQFP-216_24x24mm_P0.4mm:

datasheet: https://www.onsemi.com/pub/Collateral/566DB.PDF

LQFP-216_24x24mm_P0.4mm:
  size_source: 'https://www.onsemi.com/pub/Collateral/566DB.PDF'
  body_size_x:
    nominal: 24
    tolerance: 0
  body_size_y:
    nominal: 24
    tolerance: 0
  overall_size_x:
    nominal: 26
    tolerance: 0
  overall_size_y:
    nominal: 26
    tolerance: 0
  lead_width:
    minimum: 0.13
    maximum: 0.23
  lead_len:
    minimum: 0.45
    maximum: 0.75
  pitch: 0.4
  num_pins_x: 54
  num_pins_y: 54