Added Bourns TBU-CA family footprint

Datasheet: https://www.bourns.com/data/global/pdfs/TBU-CA.pdf

3D script: kicad-packages3D-generator!17 (merged)

This footprint was generated using kicad footprint generator, adding the following code to scripts/Packages/Package_NoLead__DFN_QFN_LGA_SON/size_definitions/dfn.yaml :

Bourns_TBU-CA:
  device_type: 'Fuse'
  manufacturer: 'Bourns'
  part_number: 'TBU-CA'
  library: 'Fuse'
  custom_name_format: 'Fuse_Bourns_TBU-CA'
  size_source: 'https://www.bourns.com/data/global/pdfs/TBU-CA.pdf'
  # ipc_class: 'qfn' # 'qfn_pull_back'
  #ipc_density: 'least' #overwrite global value for this device.
  body_size_x:
    nominal: 6.5
    tolerance: 0.1
  body_size_y:
    nominal: 4.0
    tolerance: 0.1
  lead_to_edge:
    nominal: 0.3
    tolerance: 0
  lead_width:
    nominal: 3.4
    tolerance: 0
  lead_len:
    nominal: 1.85
    tolerance: 0

  EP_size_x:
    nominal: 0.8
    tolerance: 0
  EP_size_y:
    nominal: 3.4
    tolerance: 0
  EP_pin_number: 2
#  EP_num_paste_pads: [1, 1]

  pitch: 0.4
  num_pins_x: 0
  num_pins_y: 1
  #chamfer_edge_pins: 0.25
  #pin_count_grid:
  #pad_length_addition: 0.5
  #include_suffix_in_3dpath: 'False'
  #include_pad_size: 'fp_name_only' # 'both' | 'none' (default)

However, it can't be integrated there. See details at: kicad-footprint-generator#647 (closed)

The first page of the datasheet says that this device has indeed a DFN package. However, due to its special pin numbering, it needs manual rename of the edge pin 2 to 3. Since this is only one footprint, it is not worth to write a custom generator only for it.