Add Texas Instruments WQFN-16 RTE footprint with smaller EP than the existing WQFN-16 footprints

I added one missing variant of the Texas Instruments RTE package footprints (see #2645), with and without thermal vias. Both footprints were generated using the ipc_noLead_generator.py script. They still have klc-check violations concerning the paste and mask layer (like the already existing Texas_RTE_WQFN-16-1EP_3x3mm_P0.5mm_EP1.2x0.8mm and Texas_RTE_WQFN-16-1EP_3x3mm_P0.5mm_EP1.2x0.8mm_ThermalVias), even though paste and mask layer are present on all pads.

The footprints are - counterintuitively - NOT documented in https://www.ti.com/lit/pdf/MPQF149.

1. Texas_RTE_WQFN-16-1EP_3x3mm_P0.5mm_EP0.8x0.8mm and Texas_RTE_WQFN-16-1EP_3x3mm_P0.5mm_EP0.8x0.8mm_ThermalVias

• https://www.ti.com/lit/ds/symlink/dac80504.pdf#page=47

Texas_WQFN-16_RTE0016D:
  device_type: 'WQFN'
  manufacturer: 'Texas'
  part_number: 'RTE'
  size_source: 'https://www.ti.com/lit/ds/symlink/dac80504.pdf#page=47'
  ipc_class: 'qfn'
  body_size_x:
    minimum: 2.85
    maximum: 3.15
  body_size_y:
    minimum: 2.85
    maximum: 3.15
  overall_height:
    minimum: 0.7
    maximum: 0.8

  lead_width:
    minimum: 0.18
    maximum: 0.3
  lead_len:
    minimum: 0.3
    maximum: 0.5

  EP_size_x:
    nominal: 0.8
    tolerance: 0.1
  EP_size_y:
    nominal: 0.8
    tolerance: 0.1
  EP_num_paste_pads: [2, 2]

  thermal_vias:
    count: [1, 1]
    drill: 0.2
    paste_via_clearance: 0.1
    EP_num_paste_pads: [2, 2]
    EP_paste_coverage: 0.90
    paste_avoid_via: false

  pitch: 0.5
  num_pins_x: 4
  num_pins_y: 4