Scripted SOIC-8-1EP footprint for LM5017MR

http://www.ti.com/lit/ds/symlink/lm5017.pdf#page=31

Script PR: https://github.com/pointhi/kicad-footprint-generator/pull/287

SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm:
  size_source: 'http://www.ti.com/lit/ds/symlink/lm5017.pdf#page=31'
  body_size_x:
    minimum: 3.8
    maximum: 4.0
  body_size_y:
    minimum: 4.8
    maximum: 5.0
  body_height:
    maximum: 1.7

  overall_size_x:
    minimum: 5.8
    maximum: 6.2
  lead_len:
    minimum: 0.4
    maximum: 1.27
  lead_width:
    minimum: 0.31
    maximum: 0.51

  pitch: 1.27
  num_pins_x: 0
  num_pins_y: 4

  EP_size_x:
    minimum: 2.11
    maximum: 2.71
  EP_size_x_overwrite: 2.95
  EP_mask_x: 2.71

  EP_size_y:
    minimum: 2.8
    maximum: 3.4
  EP_size_y_overwrite: 4.9
  EP_mask_y: 3.4

  EP_num_paste_pads: [2, 2]

  thermal_vias:
    count: [2, 4]
    drill: 0.2
    paste_via_clearance: 0.1
    EP_num_paste_pads: [2, 2]
    EP_paste_coverage: 0.7
    grid: [1.3, 1.3]
    paste_avoid_via: False